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	DOCUMENTS INCORPORATED BY REFERENCE
Portions of our definitive Proxy Statement to be filed with the Securities and Exchange Commission within 120 days after the end of our 2019 fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

Amendment Flag

false

Document Fiscal Year Focus

2019

Document Fiscal Period Focus

Entity Central Index Key

0000887936

Current Fiscal Year End Date

--12-31

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 369,373	$ 312,069
Accounts receivable:
Billed receivables	540,584	437,797
Unbilled receivables	418,288	319,205
Allowance for doubtful accounts and unbilled services	(265,500)	(202,394)
Accounts receivable, net	693,372	554,608
Current portion of notes receivable	35,106	29,228
Prepaid expenses and other current assets	80,810	69,448
Total current assets	1,178,661	965,353
Property and equipment, net	93,672	84,577
Operating lease assets	159,777
Goodwill	1,202,767	1,172,316
Other intangible assets, net	38,432	34,633
Notes receivable, net	69,033	84,471
Other assets	40,800	37,771
Total assets	2,783,142	2,379,121
Current liabilities
Accounts payable, accrued expenses and other	158,936	104,600
Accrued compensation	416,903	333,536
Billings in excess of services provided	36,698	44,434
Total current liabilities	612,537	482,570
Long-term debt, net	275,609	265,571
Noncurrent operating lease liabilities	176,378
Deferred income taxes	151,352	155,088
Other liabilities	78,124	127,067
Total liabilities	1,294,000	1,030,296
Commitments and contingent liabilities (Note 15)
Stockholders' equity
Preferred stock, $0.01 par value; shares authorized — 5,000; none outstanding	0	0
Common stock, $0.01 par value; shares authorized — 75,000; shares issued and outstanding — 37,390 (2019) and 38,147 (2018)	374	381
Additional paid-in capital	216,162	299,534
Retained earnings	1,413,453	1,196,727
Accumulated other comprehensive loss	(140,847)	(147,817)
Total stockholders' equity	1,489,142	1,348,825
Total liabilities and stockholders' equity	$ 2,783,142	$ 2,379,121

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	37,390,000	38,147,000
Common stock, shares outstanding (in shares)	37,390,000	38,147,000

Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenues	$ 2,352,717,000	$ 2,027,877,000	$ 1,807,732,000
Operating expenses
Direct cost of revenues	1,534,896,000	1,328,074,000	1,215,560,000
Selling, general and administrative expenses	504,074,000	465,636,000	432,013,000
Special charges	0	0	40,885,000
Amortization of other intangible assets	8,152,000	8,162,000	10,563,000
Costs and Expenses	2,047,122,000	1,801,872,000	1,699,021,000
Operating income	305,595,000	226,005,000	108,711,000
Other income (expense)
Interest income and other	2,061,000	4,977,000	3,752,000
Interest expense	(19,206,000)	(27,149,000)	(25,358,000)
Gain on sale of business	0	13,031,000	0
Loss on early extinguishment of debt	0	(9,072,000)	0
Other income (expense)	(17,145,000)	(18,213,000)	(21,606,000)
Income before income tax provision	288,450,000	207,792,000	87,105,000
Income tax provision	71,724,000	57,181,000	(20,857,000)
Net income	$ 216,726,000	$ 150,611,000	$ 107,962,000
Earnings per common share — basic (in dollars per share)	$ 5.89	$ 4.06	$ 2.79
Earnings per common share — diluted (in dollars per share)	$ 5.69	$ 3.93	$ 2.75
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments, net of tax expense of $—, $373 and $—	$ 6,970,000	$ (27,602,000)	$ 30,664,000
Other comprehensive income (loss), net of tax	6,970,000	(27,602,000)	30,664,000
Comprehensive income	$ 223,696,000	$ 123,009,000	$ 138,626,000

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Foreign currency translation adjustments, tax expense	$ 0	$ 373	$ 0

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2016		42,037
Beginning Balance at Dec. 31, 2016	$ 1,207,358	$ 420	$ 416,816	$ 941,001	$ (150,879)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,962			107,962
Other comprehensive income:
Cumulative translation adjustment	30,664				30,664
Issuance of common stock in connection with:
Exercise of options (in shares)		123
Exercise of options	4,133	$ 1	4,132
Restricted share grants (in shares)		243
Restricted share grants	(4,440)	$ 2	(4,442)
Stock units issued under incentive compensation plan	1,547		1,547
Purchase and retirement of common stock (in shares)		(4,674)
Purchase and retirement of common stock	(168,094)	$ (46)	(168,048)
Cumulative effect due to adoption of new accounting standard	(3,189)		0	(3,189)
Share-based compensation	16,030		16,030
Ending Balance (in shares) at Dec. 31, 2017		37,729
Ending Balance at Dec. 31, 2017	1,191,971	$ 377	266,035	1,045,774	(120,215)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	150,611			150,611
Other comprehensive income:
Cumulative translation adjustment	(27,602)				(27,602)
Issuance of common stock in connection with:
Exercise of options (in shares)		1,051
Exercise of options	41,568	$ 11	41,557
Restricted share grants (in shares)		319
Restricted share grants	(3,094)	$ 3	(3,097)
Stock units issued under incentive compensation plan	1,059		1,059
Purchase and retirement of common stock (in shares)		(952)
Purchase and retirement of common stock	(55,738)	$ (10)	(55,728)
Cumulative effect due to adoption of new accounting standard	342			342
Conversion feature of convertible senior notes, due 2023, net	34,131		34,131
Share-based compensation	$ 15,577		15,577
Ending Balance (in shares) at Dec. 31, 2018	38,147	38,147
Ending Balance at Dec. 31, 2018	$ 1,348,825	$ 381	299,534	1,196,727	(147,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	216,726			216,726
Other comprehensive income:
Cumulative translation adjustment	$ 6,970				6,970
Issuance of common stock in connection with:
Exercise of options (in shares)	256	256
Exercise of options	$ 9,688	$ 3	9,685
Restricted share grants (in shares)		245
Restricted share grants	(6,517)	$ 3	(6,520)
Stock units issued under incentive compensation plan	1,413		1,413
Purchase and retirement of common stock (in shares)		(1,258)
Purchase and retirement of common stock	(105,941)	$ (13)	(105,928)
Share-based compensation	$ 17,978		17,978
Ending Balance (in shares) at Dec. 31, 2019	37,390	37,390
Ending Balance at Dec. 31, 2019	$ 1,489,142	$ 374	$ 216,162	$ 1,413,453	$ (140,847)

Consolidated Statements of Stockholders' Equity (Parenthetical) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Restricted share grants, settled (in shares)	78	58	92

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 216,726	$ 150,611	$ 107,962
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,153	31,536	31,177
Amortization and impairment of other intangible assets	8,152	8,162	10,563
Acquisition-related contingent consideration	2,372	479	2,291
Provision for doubtful accounts	19,602	17,872	15,386
Share-based compensation	17,978	15,577	16,030
Amortization of debt discount and issuance costs	11,615	5,456	1,984
Loss on early extinguishment of debt	0	9,072	0
Gain on sale of business	0	(13,031)	0
Deferred income taxes	(3,712)	20,831	(51,579)
Other	302	769	611
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(141,894)	(72,034)	(50,831)
Notes receivable	10,445	8,987	14,928
Prepaid expenses and other assets	(22,648)	(2,258)	629
Accounts payable, accrued expenses and other	(8,907)	8,908	4,421
Income taxes	24,496	(8,890)	25,811
Accrued compensation	61,339	52,510	1,795
Billings in excess of services provided	(8,133)	(3,885)	16,447
Net cash provided by operating activities	217,886	230,672	147,625
Investing activities
Proceeds from sale of business	0	50,283	0
Payments for acquisition of businesses, net of cash received	(18,791)	0	(8,929)
Purchases of property and equipment	(42,072)	(32,270)	(32,004)
Other	257	731	295
Net cash provided by (used in) investing activities	(60,606)	18,744	(40,638)
Financing activities
Borrowings under revolving line of credit	45,000	233,500	422,000
Repayments under revolving line of credit	(45,000)	(333,500)	(392,000)
Proceeds from issuance of convertible notes	0	316,250	0
Payments of long-term debt	0	(300,000)	0
Payments of debt issue and debt prepayment costs	0	(16,149)	0
Purchase and retirement of common stock	(105,797)	(55,738)	(168,094)
Net issuance of common stock under equity compensation plans	3,171	38,475	(504)
Payments for business acquisition liabilities	(2,282)	(3,029)	(5,161)
Deposits and other	1,597	2,672	2,825
Net cash used in financing activities	(103,311)	(117,519)	(140,934)
Effect of exchange rate changes on cash and cash equivalents	3,335	(9,789)	7,750
Net increase (decrease) in cash and cash equivalents	57,304	122,108	(26,197)
Cash and cash equivalents, beginning of period	312,069	189,961	216,158
Cash and cash equivalents, end of period	369,373	312,069	189,961
Supplemental cash flow disclosures
Cash paid for interest	7,606	21,687	23,285
Cash paid for income taxes, net of refunds	50,941	45,568	4,929
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	1,413	1,059	1,547
Business acquisition liabilities not yet paid	$ 9,746	$ 0	$ 3,426

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Description of Business and Summary of Significant Accounting Policies

Description of Business

FTI Consulting, Inc., including its consolidated subsidiaries (collectively, the “Company,” “we,” “our” or “FTI Consulting”), is a global business advisory firm dedicated to helping organizations manage change, mitigate risk and resolve disputes: financial, legal, operational, political and regulatory, reputational and transactional. Individually, each of our segments and practices is staffed with experts recognized for the depth of their knowledge and a track record of making an impact. Collectively, FTI Consulting offers a comprehensive suite of services designed to assist clients across the business cycle, from proactive risk management to rapid response to unexpected events and dynamic environments. We operate through five reportable segments: Corporate Finance & Restructuring (“Corporate Finance”), Forensic and Litigation Consulting (“FLC”), Economic Consulting, Technology and Strategic Communications.

Accounting Principles

Our financial statements are prepared in conformity with United States (“U.S.”) generally accepted accounting principles (“GAAP”). The consolidated financial statements include the accounts of FTI Consulting and all of our subsidiaries. All intercompany transactions and balances have been eliminated. Reclassifications of certain prior period amounts have been made to conform to the current period presentation.

Foreign Currency

Results of operations for our non-U.S. subsidiaries are translated from the designated functional currency to the reporting currency of the U.S. dollar ("USD"). Revenues and expenses are translated at average exchange rates for each month, while assets and liabilities are translated at balance sheet date exchange rates. Resulting net translation adjustments are recorded as a component of stockholders’ equity in “Accumulated other comprehensive income (loss).”

Transaction gains and losses arising from currency exchange rate fluctuations on transactions denominated in a currency other than the local functional currency are included in “Interest income and other” on the Consolidated Statements of Comprehensive Income. Such transaction gains and losses may be realized or unrealized depending upon whether the transaction settled during the period or remains outstanding at the balance sheet date.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the consolidated financial statements and accompanying notes. Due to the inherent uncertainty involved in making those assumptions, actual results could differ from those estimates. Our most significant estimates relate to the determination of the allowance for doubtful accounts and unbilled services, the assessment of the recoverability of goodwill, the realization of deferred tax assets and the fair value of acquisition-related contingent consideration. Management bases its estimates on historical trends, current experience and other assumptions that it believes are reasonable.

Concentrations of Risk

We do not have a single customer that represents 10% or more of our consolidated revenues. We derive the majority of our revenues from providing professional services to clients in the U.S. For the year ended December 31, 2019, we derived approximately 34% of our consolidated revenues from the work of professionals who are assigned to locations outside the U.S. We believe that the geographic and industry diversity of our customer base throughout the U.S. and internationally minimizes the risk of incurring material losses due to concentrations of credit risk.

Revenue Recognition

Revenues are recognized when we satisfy a performance obligation by transferring services promised in a contract to a customer, in an amount that reflects the consideration that we expect to receive in exchange for those services. Performance obligations in our contracts represent distinct or separate services that we provide to our customers.

We evaluate our revenue contracts with customers based on the five-step model under Revenue from Contracts with Customers: (1) identify the contract with the customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to separate performance obligations; and (5) recognize revenues when

(or as) each performance obligation is satisfied. If, at the outset of an arrangement, we determine that a contract with enforceable rights and obligations does not exist, revenues are deferred until all criteria for an enforceable contract are met.

We generate the majority of our revenues by providing consulting services to our clients. Most of our consulting service contracts are based on one of the following types of arrangements:

•

Time and expense arrangements require the client to pay us based on the number of hours worked at contractually agreed-upon rates. We recognize revenues for these arrangements based on hours incurred and contracted rates utilizing a right-to-invoice practical expedient because we have a right to consideration for services completed to date. When a time and expense arrangement has a not-to-exceed or "cap" amount and we expect to perform work in excess of the cap, we recognize revenues up to the cap amount specified by the client, based on the efforts or hours incurred as a percentage of total efforts or hours expected to be incurred (i.e., proportional performance method). Certain time and materials arrangements may be subject to third-party approval, e.g., a court or other regulatory institution, with interim billing and payments made and received based upon preliminarily agreed-upon rates. In such cases, we record revenues for the portion of our services based on our assessment of the expected probability of amounts ultimately to be agreed upon by the court or regulator. These assessments are made on a case-by-case basis depending on the nature of the engagement, client economics, historical experience and other appropriate factors.


•	Fixed-fee arrangements require the client to pay a pre-established fee in exchange for a predetermined set of professional services. We recognize revenues for these arrangements based on the proportional performance related to individual performance obligations within each arrangement; however, these arrangements generally have one performance obligation.


•	Performance-based or contingent arrangements represent forms of variable consideration. In these arrangements, our fees are based on the attainment of contractually defined objectives with our client, such as completing a business transaction or assisting the client in achieving a specific business objective. We recognize revenues earned to date by applying the proportional performance method.

In addition, we generate certain revenues from our Technology segment that are based on units of data stored or processed. Unit-based revenues are recognized as services are provided, based on either the amount of data stored or processed, the number of concurrent users accessing the information or the number of pages or images processed for a client, and agreed-upon per unit rates.

Certain of our time and expense and fixed-fee billing arrangements may include client incentives in the form of volume-based discounts, where if certain fee levels are reached, the client can receive future services at a discounted hourly rate. Contracts with customers that have a prospective discounted pricing option based on predetermined volume thresholds are evaluated to determine whether they include a material right, which is an option that provides a customer the right to acquire free or discounted goods or services in the future. If the option provides a material right to the customer, we allocate a portion of the transaction price to the material right and defer revenues during the pre-discount period, compared with our previous practice of recognizing the reduction in revenues when customers became eligible to receive the volume discount.

Reimbursable expenses, including those relating to travel, out-of-pocket expenses, outside consultants and other outside service costs, are generally included in revenues, and an equivalent amount of reimbursable expenses is included in costs of services in the period in which the expense is incurred.

Direct Cost of Revenues

Direct cost of revenues consists primarily of billable employee compensation and related payroll benefits, the cost of contractors assigned to revenue-generating activities and direct expenses billable to clients. Direct cost of revenues also includes expense for cloud-based computing, as well as depreciation expense on the software used to host and process client information. Direct cost of revenues does not include an allocation of corporate overhead and non-billable segment costs.

Share-Based Compensation

Share-based compensation cost is estimated at the grant date based on the fair value of the award and is recognized as expense over the requisite service period or performance period of the award. The amount of share-based compensation expense recognized at any date must at least equal the portion of grant date value of the award that is vested at that date.

The fair value of restricted share awards and restricted stock units is measured based on the closing price of the underlying stock on the date of grant. The fair value of performance share units that contain market-based vesting conditions is measured using a Monte Carlo pricing model. The compensation cost of performance stock units with market-based vesting conditions is based on the grant date fair value and is not subsequently reversed if it is later determined that the market

condition is unlikely to be met or is expected to be lower than originally expected. For performance share units that contain performance-based vesting conditions, the compensation cost is adjusted each reporting period based on the probability of the awards vesting.

We use the Black-Scholes pricing model to determine the fair value of stock options on the date of grant. The Black-Scholes pricing model requires the development of assumptions, including volatility and expected term, which are based on our historical experience. The risk-free interest rate is based on the term of U.S. Treasury interest rates that is consistent with the expected term of the share-based award.

For all our share-based awards, we recognize forfeitures in compensation cost when they occur.

Advertising Costs

Advertising costs consist of marketing, advertising through print and other media, professional event sponsorship and public relations. These costs are expensed as incurred. Advertising costs totaled $18.6 million, $15.5 million and $14.8 million for the years ended December 31, 2019, 2018 and 2017, respectively, and are included in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income.

Acquisition-Related Contingent Consideration

The fair value of acquisition-related contingent consideration is estimated at the acquisition date utilizing either a probability weighted estimate of future cash flow adjusted for the expected timing of each payment or a Monte Carlo simulation. Subsequent to the acquisition date, on a quarterly basis, the contingent consideration liability is remeasured at current fair value with any changes recorded in earnings. Accretion expense is recorded to acquisition-related contingent consideration liabilities for changes in fair value due to the passage of time. Remeasurement gains or losses and accretion expense are included in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income.

Income Taxes

Our income tax provision (benefit) consists principally of U.S. federal, state and international income taxes. We generate income in a significant number of states located throughout the U.S., as well as foreign countries in which we conduct business. Our effective income tax rate may fluctuate due to a change in the mix of earnings between higher and lower state or country tax jurisdictions and the impact of non-deductible expenses. Additionally, we record deferred tax assets and liabilities using the asset and liability method of accounting, which requires us to measure these assets and liabilities using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is recognized if, based on the weight of available evidence, it is more likely than not that some portion, or all, of the deferred tax asset will not be realized. In evaluating our ability to recover our deferred tax assets, we consider all available positive and negative evidence, including scheduled reversals of temporary differences, projected future taxable income, tax planning strategies and recent results of operations.

Cash Equivalents

Cash equivalents consist of money market funds, commercial paper and certificates of deposit with maturities of three months or less at the time of purchase.

Allowance for Doubtful Accounts and Unbilled Services

We maintain an allowance for doubtful accounts and unbilled services for estimated losses resulting from potential fee reductions negotiated with specific clients or imposed by bankruptcy courts or other regulatory agencies and the inability of specific clients to pay our fees, as well as from disputes that affect our ability to fully collect our billed accounts receivable. Even if a bankruptcy court approves our services, the court has the discretion to require us to refund all or a portion of our fees due to the outcome of the case or a variety of other factors. We estimate the allowance for all receivable risks by reviewing the status of each matter and recording reserves based on our experience and knowledge of specific client collections and the Company's historical collection patterns for similar client collections. However, our actual experience may vary significantly from our estimates. If the financial condition of our clients were to deteriorate, resulting in their inability or unwillingness to pay our fees, or bankruptcy courts require us to refund certain fees, we may need to record additional allowances or write-offs in future periods. This risk related to a client’s non-payment may be mitigated to the extent that we receive a retainer from some of our clients prior to performing services.

We record adjustments to the allowance for doubtful accounts and unbilled services as a reduction in revenues when there are changes in estimates of fee reductions that may be imposed by bankruptcy courts and other regulatory institutions for

both billed and unbilled receivables. The allowance for doubtful accounts and unbilled services is also adjusted after the related work has been billed to the client and we discover that collectability is not reasonably assured. These adjustments are recorded to “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income. Our bad debt expense totaled $19.6 million, $17.9 million and $15.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Property and Equipment

We record property and equipment, including improvements that extend useful lives, at cost, while maintenance and repairs are expensed as incurred. We calculate depreciation using the straight-line method based on estimated useful lives ranging from three years to seven years for furniture, equipment and software. We amortize leasehold improvements over the shorter of the estimated useful life of the asset or the lease term. We capitalize costs incurred during the application development stage of computer software developed or obtained for internal use. Capitalized software developed for internal use is classified within furniture, equipment and software and is amortized over the estimated useful life of the software, which is generally three years. Purchased software licenses to be sold to customers are capitalized and amortized over the license term.

Notes Receivable from Employees

Notes receivable from employees principally include unsecured general recourse forgivable loans and retention payments, which are provided to attract and retain certain of our senior employees and other professionals. Generally, all of the principal amount and accrued interest of the forgivable loans we make to employees and other professionals will be forgiven according to the stated terms of the loan agreement, provided that the professional is providing services to the Company on the forgiveness date and upon other specified events, such as death or disability. Professionals who terminate their employment or services with us prior to the end of the forgiveness period are required to repay the outstanding, unforgiven loan balance and any accrued but unforgiven interest. If the termination was by the Company without cause or by the employee with good reason, or, subject to certain conditions, if the employee terminates his or her employment due to retirement or non-renewal of his or her employment agreement, the loan may be forgiven or continue to be forgivable, in whole or in part. We amortize forgivable loans ratably over the requisite service period, which ranges from a period of one year to 10 years. The amount of expense recognized at any date must at least equal to the portion of the principal forgiven on the forgiveness date.

Goodwill and Other Intangible Assets

Goodwill represents the purchase price of acquired businesses in excess of the fair market value of net assets acquired at the date of acquisition. Other intangible assets may include customer relationships, trademarks and acquired software.

We test our goodwill and other indefinite-lived intangible assets for impairment annually as of the first day of the fourth quarter or whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. On a quarterly basis, we monitor the key drivers of fair value to detect events or other changes that would warrant an interim impairment test. Important factors we consider that could trigger an interim impairment review include, but are not limited to, the following:


•	significant underperformance relative to expected historical or projected future operating results;


•	a significant change in the manner of our use of the acquired asset or the strategy for our overall business;


•	a significant market decline related to negative industry or economic trends; and/or


•	our market capitalization relative to net carrying value.

We assess our goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or a business one level below that operating segment if discrete financial information is available and regularly reviewed by the chief operating decision makers. Entities have an option, under certain circumstances, to perform a qualitative assessment regarding the reporting unit’s fair value to determine whether it is necessary to perform the quantitative impairment test.

In the qualitative assessment, we consider various factors, events or circumstances, including macroeconomic conditions, industry and market considerations, cost factors, overall financial performance and other relevant reporting unit specific events. If, based on the qualitative assessment, an entity determines that it is not “more likely than not” that the fair value of a reporting unit is less than its carrying value, we do not prepare a quantitative impairment test. If we determine otherwise, we will prepare a quantitative assessment for potential goodwill impairment.

In the quantitative assessment, we compare the estimated fair value of the reporting unit with the carrying amount of that reporting unit. We estimate fair value using a combination of an income approach (based on discounted cash flows) and

market approaches, using appropriate weighting factors. If the fair value exceeds the carrying amount, goodwill is not impaired. However, if the carrying value exceeds the fair value of the reporting unit, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.

We determine whether to perform a qualitative assessment first or to bypass the qualitative assessment and proceed with the quantitative goodwill impairment test for each of our reporting units based on the excess of fair value over carrying value from the most recent quantitative tests and other events or changes in circumstances that could impact the fair value of the reporting units.

Intangible assets with finite lives are amortized over their estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate an asset’s carrying value may not be recoverable. We amortize our acquired finite-lived intangible assets on a straight-line basis over periods ranging from three to 15 years.

Impairment of Long-Lived Assets

We review long-lived assets such as property and equipment, operating lease assets and finite-lived intangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. These events or changes in circumstances may include a significant deterioration of operating results, changes in business plans or changes in anticipated future cash flows. If an impairment indicator is present, we evaluate recoverability of assets to be held and used by a comparison of the carrying value of the assets with future undiscounted net cash flows expected to be generated by the assets. We group assets at the lowest level for which there are identifiable cash flows that are largely independent of the cash flows generated by other asset groups. If the total of the expected undiscounted future cash flows is less than the carrying amount of the asset group, we estimate the fair value of the asset group to determine whether an impairment loss should be recognized.

Leases

As of January 1, 2019, the Company adopted Accounting Standards Update ("ASU") 2016-02, Leases, which was amended in some respects by subsequent ASUs (collectively Accounting Standards Codification (“ASC") 842 ("ASC 842")) and supersedes existing lease guidance. The standard requires us to record operating lease assets and corresponding lease liabilities on the balance sheet and disclose key quantitative and qualitative information about our lease contracts.

Under ASC 842, we determine if a contract is a leasing arrangement at inception. Operating lease assets represent our right to control the use of an identified asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. We use the incremental borrowing rate on the commencement date in determining the present value of our lease payments. We recognize operating lease expense for our operating leases on a straight-line basis over the lease term.

We lease office space and equipment under non-cancelable operating leases which may include renewal or termination options that are reasonably certain of exercise. Most leases include one or more options to renew, with renewal terms that can extend the lease term up to seven years. Leases with an initial term of 12 months or less are not recorded on the balance sheet and are expensed on a straight-line basis. Lease and non-lease components are accounted for together as a single lease component for operating leases associated with our office space and our equipment leases. We apply a portfolio approach for certain equipment leases to effectively account for the operating lease assets and liabilities.

Billings in Excess of Services Provided

Billings in excess of services provided represent amounts billed to clients, such as retainers, in advance of work being performed. Clients may make advance payments, which are held on deposit until completion of work or are applied at predetermined amounts or times. Excess payments are either applied to final billings or refunded to clients upon completion of work. Payments in excess of related accounts receivable and unbilled receivables are recorded as billings in excess of services provided within the liabilities section of the Consolidated Balance Sheets.

Convertible Notes

On August 20, 2018, we issued 2.0% convertible senior notes due 2023 ("2023 Convertible Notes") with an aggregate principal amount of $316.3 million, payable semiannually in arrears on February 15 and August 15 of each year, beginning on February 15, 2019. The 2023 Convertible Notes will mature on August 15, 2023, unless earlier converted or repurchased. Upon conversion, the 2023 Convertible Notes may be settled, at our election in cash, shares of our common stock, or a combination of cash and shares of our common stock.

We separately recorded the liability and equity components of the 2023 Convertible Notes. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the 2023 Convertible Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount ("debt discount") is amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method.

We record debt issuance costs as an adjustment to the carrying amount of the related liability and equity components of our 2023 Convertible Notes. We amortize the debt discount and debt issuance costs on the liability component using the effective interest rate method over the expected life of the debt instrument.

New Accounting Standards	12 Months Ended
New Accounting Standards	Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Recently Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers. On January 1, 2018, we adopted ASC 606 using the modified retrospective method and recorded an immaterial cumulative effect adjustment to the beginning balance of retained earnings for revenue contracts that existed at the adoption date. Under the modified retrospective method, prior year information has not been adjusted and continues to be reported under the accounting standards in effect for periods prior to the adoption date. We have not retroactively restated the existing contracts for modifications that occurred before January 1, 2018. See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies and methods used in preparation of the Consolidated Financial Statements. See Note 4, “Revenues” for the disclosures required under ASC 606. The adoption of ASC 606 had an immaterial impact on our Consolidated Statements of Comprehensive Income and Consolidated Balance Sheets and had no impact on our Consolidated Statements of Cash Flows. In February 2016, the FASB issued ASU 2016-02, Leases, which was amended in some respects by subsequent ASUs. We adopted ASC 842 using the modified retrospective basis for reporting. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed us to carry forward the historical lease classification for existing leases on the adoption date, and allowed us not to reassess whether an existing contract contains a lease or initial direct costs. As permitted by the guidance, prior comparative periods will not be adjusted under this method. See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies for our operating leases. See Note 14, "Leases" for the disclosures required under ASC 842. The adoption of this standard resulted in recognition of operating lease assets in the amount of $148.5 million and lease liabilities in the amount of $206.7 million for operating leases on our Consolidated Balance Sheets as of January 1, 2019. Our existing deferred rent and cease-use liabilities were $62.3 million as of December 31, 2018 and were included as a reduction to the initial measurement of our operating lease assets. Our existing prepaid rent balance was $4.1 million as of December 31, 2018 and was included as a reduction to the initial measurement of our operating lease liabilities. There was no material impact on the Consolidated Statements of Comprehensive Income, Consolidated Statements of Stockholders’ Equity or Consolidated Statements of Cash Flows. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement, which eliminates, adds and modifies certain disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes to the financial statements and is effective for annual and interim periods beginning after December 15, 2019. We elected, as permitted by the standard, to early adopt ASU 2018-13 as of December 31, 2019 and have prospectively applied the modifications which are limited to presentation and disclosure changes that did not have a material impact on the consolidated financial statements. Accounting Standards Not Yet Adopted In August 2018, the FASB issued ASU 2018-15, Internal Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which requires the Company to capitalize implementation costs of a hosting arrangement that is a service contract and expense those costs over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019 although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

Earnings per Common Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Earnings per Common Share

Basic earnings per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share adjusts basic earnings per common share for the effects of potentially dilutive common shares. Potentially dilutive common shares include the dilutive effects of shares issuable under our equity compensation plans, including restricted shares and stock options, each using the treasury stock method.

Because we expect to settle the principal amount of the outstanding 2023 Convertible Notes in cash, we use the treasury stock method for calculating the potential dilutive effect of the conversion feature on earnings per common share, if applicable. The conversion feature had a dilutive impact on earnings per common share for the year ended December 31, 2019, as the average market price per share of our common stock for the period exceeded the conversion price of $101.38 per share. See Note 13, "Debt" for additional information about the 2023 Convertible Notes.



	Year Ended December 31,
	2019		2018		2017
Numerator — basic and diluted
Net income	$	216,726	$	150,611	$	107,962
Denominator
Weighted average number of common shares outstanding — basic	36,774		37,098		38,697
Effect of dilutive convertible notes	62		—		—
Effect of dilutive stock options	455		491		117
Effect of dilutive restricted shares	820		729		378
Weighted average number of common shares outstanding — diluted	38,111		38,318		39,192
Earnings per common share — basic	$	5.89	$	4.06	$	2.79
Earnings per common share — diluted	$	5.69	$	3.93	$	2.75
Antidilutive stock options and restricted shares	19		175		1,561

Revenues

12 Months Ended

Dec. 31, 2019

Revenue from Contract with Customer [Abstract]

Revenues

We generate the majority of our revenues by providing consulting services to our clients. Most of our consulting service contracts are based on one of the following types of arrangements:


•	Time and expense arrangements require the client to pay us based on the number of hours worked at contractually agreed-upon rates. We recognize revenues for these arrangements based on hours incurred and contracted rates utilizing a right-to-invoice practical expedient because we have a right to consideration for services completed to date.


•	Fixed-fee arrangements require the client to pay a pre-established fee in exchange for a predetermined set of professional services. We recognize revenues for these arrangements based on the proportional performance related to individual performance obligations within each arrangement; however, these arrangements generally have one performance obligation.


•	Performance-based or contingent arrangements represent forms of variable consideration. In these arrangements, our fees are based on the attainment of contractually defined objectives with our client, such as completing a business transaction or assisting the client in achieving a specific business objective. We recognize revenues earned to date by applying the proportional performance method.

Revenues are recognized when we satisfy a performance obligation by transferring services promised in a contract to a customer and in an amount that reflects the consideration that we expect to receive in exchange for those services. Performance obligations in our contracts represent distinct or separate services that we provide to our customers.

Revenues recognized during the current period may include revenues from performance obligations satisfied or partially satisfied in previous periods. This primarily occurs when the estimated transaction price has changed based on our current probability assessment over whether the agreed-upon outcome for our performance-based and contingent arrangements will be achieved. The aggregate amount of revenues recognized related to a change in the transaction price in the current period, which related to performance obligations satisfied or partially satisfied in a prior period, was $28.9 million and $16.1 million for the years ended December 31, 2019 and 2018, respectively.

Unfulfilled performance obligations represent the remaining contract transaction prices allocated to the performance obligations that are unsatisfied. Unfulfilled performance obligations primarily consist of fees not yet recognized on a proportional performance basis for fixed-fee arrangements and performance-based and contingent arrangements. As of December 31, 2019 and December 31, 2018, the aggregate amount of the remaining contract transaction price allocated to unfulfilled performance obligations was $2.3 million and $8.8 million, respectively, and we expect to recognize the majority of the related revenues over the next 24 months. We elected to utilize the optional exemption to exclude from this disclosure fixed-fee and performance-based and contingent arrangements with an original expected duration of one year or less and to exclude our time and expense arrangements for which revenues are recognized using the right-to-invoice practical expedient.

Contract assets are defined as assets for which we have recorded revenue but are not yet entitled to receive our fees because certain events, such as completion of the measurement period or client approval, must occur. The contract asset balance was $1.3 million and $2.4 million as of December 31, 2019 and 2018, respectively.

Contract liabilities are defined as liabilities incurred when we have received consideration but have not yet performed the agreed-upon services. This may occur when clients pay us upfront fees before we begin work for them. The contract liability balance was immaterial as of December 31, 2019 and 2018.

Special Charges

12 Months Ended

Dec. 31, 2019

Other Liabilities Disclosure [Abstract]

Special Charges

There were no special charges recorded during the years ended December 31, 2019 and December 31, 2018.

During the year ended December 31, 2017, we recorded special charges of $40.9 million. The charges related to certain targeted reductions in areas of each segment where we needed to realign our workforce with then-current business demand. In addition, cost-cutting actions were taken in certain corporate departments where we were able to streamline support activities and reduce our real estate costs. The special charge included the following components:


•	$23.5 million of employee severance and other employee-related costs;


•	$14.4 million of exit costs associated with the curtailment of our lease on our executive office in Washington, D.C.; and

•

$3.0 million of other expenses, including costs related to disposing or closing several small international offices.

Share-Based Compensation

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Share-Based Compensation

Share-Based Incentive Compensation Plans

Under the Company's 2017 Omnibus Incentive Compensation Plan, effective as of June 7, 2017, there were 1,396,183 shares of common stock available for grant as of December 31, 2019.

Share-Based Compensation Expense

The table below reflects the total share-based compensation expense recognized in our Consolidated Statements of Comprehensive Income for the years ended December 31, 2019, 2018 and 2017.



	2019				2018				2017
			Restricted				Restricted				Restricted
Income Statement Classification	Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾
Direct cost of revenues	$	497	$	11,869	$	780	$	9,804	$	370	$	9,691
Selling, general and administrative expenses	2,628		9,005		2,027		8,191		1,207		4,870
Special charges	—		—		—		—		—		269
Total	$	3,125	$	20,874	$	2,807	$	17,995	$	1,577	$	14,830


⁽¹⁾	Includes options and cash-settled stock appreciation rights.


⁽²⁾	Includes restricted share awards, restricted stock units, performance stock units and cash-settled restricted stock units.

Stock Options

We did not grant any options during the years ended December 31, 2019 and 2018. We used the Black-Scholes option-pricing model to determine the fair value of our option grants during the year ended December 31, 2017 using the assumptions in the table below.



		Year Ended December 31,
Assumptions		2017
Risk-free interest rate		1.60%
Dividend yield		—%
Expected term		3 years
Stock price volatility		31.94%

A summary of our stock option activity during the year ended December 31, 2019 is presented below. The aggregate intrinsic value of stock options outstanding and exercisable, or fully vested, at December 31, 2019 in the table below represents the total pre-tax intrinsic value, which is calculated as the difference between the closing price of our common stock on the last trading day of 2019 and the exercise price, multiplied by the number of in-the-money options that would have been received by the option holders had all option holders exercised their options on December 31, 2019. The aggregate intrinsic value changes based on fluctuations in the fair market value per share of our common stock.



	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Stock options outstanding at December 31, 2018	935		$	36.50
Stock options granted	—		N/A
Stock options exercised	(256	)	$	37.88
Stock options forfeited	(1	)	$	30.28
Stock options outstanding at December 31, 2019	678		$	35.98	4.7	$	50,669
Stock options exercisable at December 31, 2019	605		$	35.75	4.6	$	45,343

Cash received from option exercises for the years ended December 31, 2019, 2018 and 2017 was $9.7 million, $41.6 million and $4.1 million, respectively. The tax benefit realized from stock options exercised totaled $0.7 million, $4.0 million and $1.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.

The intrinsic value of stock options exercised is the amount by which the market value of our common stock on the exercise date exceeds the exercise price. The total intrinsic value of stock options exercised for the years ended December 31, 2019, 2018 and 2017 was $13.2 million, $26.4 million and $0.9 million, respectively.

The following is a summary of stock options outstanding and exercisable as of December 31, 2019.



	Options Outstanding				Options Exercisable
		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)		Weighted Average Exercise Price
Exercise Price Range	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Shares	Weighted Average Exercise Price
$26.68-$33.95	137	$	31.46	3.7	124	$	31.53
$34.33-$34.62	138	$	34.40	5.4	138	$	34.40
$35.73-$36.87	195	$	36.67	4.4	188	$	36.68
$36.89-$40.36	202	$	39.28	5.4	149	$	39.12
$41.69-$41.69	6	$	41.69	0.3	6	$	41.69
	678				605

As of December 31, 2019, there was $0.1 million of unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized ratably over a weighted average period of 0.2 years.

Restricted Share Awards

A summary of our restricted share activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2018	992		$	43.76
Restricted share awards granted	222		$	81.64
Restricted share awards vested	(229	)	$	43.04
Restricted share awards forfeited	(28	)	$	38.87
Unvested restricted share awards outstanding at December 31, 2019	957		$	52.86

As of December 31, 2019, there was $27.5 million of unrecognized compensation cost related to unvested restricted share awards. That cost is expected to be recognized ratably over a weighted average period of 4.0 years. The total fair value of restricted share awards that vested during the years ended December 31, 2019, 2018 and 2017 was $18.6 million, $10.4 million and $9.9 million, respectively.

Restricted Stock Units

A summary of our restricted stock units activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Restricted stock units outstanding at December 31, 2018	335		$	39.72
Restricted stock units granted	30		$	82.39
Restricted stock units released	(52	)	$	42.15
Restricted stock units forfeited	—		N/A
Restricted stock units outstanding at December 31, 2019	313		$	43.45

As of December 31, 2019, there was $0.8 million of unrecognized compensation cost related to unvested restricted stock units. That cost is expected to be recognized ratably over a weighted average period of 2.8 years. The total fair value of restricted stock units released for the years ended December 31, 2019, 2018 and 2017 was $4.5 million, $5.4 million and $4.1 million, respectively.

Performance Stock Units

Performance stock units represent common stock potentially issuable in the future, subject to achievement of either market or performance conditions. Our current outstanding performance stock units that are subject to market conditions vest based on the adjusted total shareholder return of the Company as compared with the adjusted total shareholder return of the Standard & Poor’s 500 Index over the applicable performance period. Our current outstanding performance stock units that are subject to performance conditions vest based on Adjusted EBITDA metrics over the applicable performance period. The vesting and payout for all of our performance stock units typically range between 0% and up to 150% of the target number of shares granted at the end of a two- or three-year performance period.

A summary of our performance stock units activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Performance stock units outstanding at December 31, 2018	275		$	42.60
Performance stock units granted ⁽¹⁾	170		$	77.67
Performance stock units released	(84	)	$	35.75
Performance stock units forfeited	—		N/A
Performance stock units outstanding at December 31, 2019	361		$	60.67


⁽¹⁾	Performance stock units granted are presented at the maximum potential payout percentage of 150% of target shares granted.

As of December 31, 2019, there was $6.3 million of unrecognized compensation cost related to unvested performance stock units. That cost is expected to be recognized ratably over a weighted average period of 1.1 years. The total fair value of performance stock units that released during the years ended December 31, 2019 and 2018 was $5.8 million and $1.4 million, respectively. There were no performance stock units that released during the year ended December 31, 2017.

The table below reflects the weighted average grant date fair value per share of stock options, restricted share awards, restricted stock units and performance stock units awarded during the years ended December 31, 2019, 2018 and 2017. The fair value of our stock options is calculated using the Black-Scholes option-pricing model. The fair value of our restricted stock awards, restricted stock units and our performance stock units that are subject to performance conditions is determined based on the closing market price per share of our common stock on the grant date. The fair value of our performance stock units that are subject to market conditions reflects the market conditions as of the grant date using a Monte Carlo simulation.



	Year Ended December 31,
	2019		2018		2017
Weighted average fair value of grants
Stock options	$	—	$	—	$	9.56
Restricted share awards, restricted stock units and performance stock units	$	80.10	$	51.73	$	38.88

Interest Income and Other

12 Months Ended

Dec. 31, 2019

Other Income and Expenses [Abstract]

Interest Income and Other

The table below presents the components of “Interest income and other” as shown on the Consolidated Statements of Comprehensive Income.



	Year Ended December 31,
Interest Income and Other	2019			2018			2017
Interest income	$	4,761		$	5,448		$	3,968
Foreign exchange transaction gains (losses), net	(3,056		)	261			(77		)
Other	356			(732		)	(139		)
Total	$	2,061		$	4,977		$	3,752

Balance Sheet Details

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Details



	December 31,
	2019		2018
Prepaid expenses and other current assets
Prepaid expenses	$	39,740	$	35,762
Income tax receivable	8,161		18,947
Other current assets	32,909		14,739
Total	$	80,810	$	69,448
Accounts payable, accrued expenses and other
Accounts payable	$	18,346	$	17,728
Accrued expenses	46,511		52,461
Accrued interest payable	2,243		2,358
Accrued taxes payable	35,895		13,119
Current operating lease liabilities	35,727		—
Other current liabilities	20,214		18,934
Total	$	158,936	$	104,600

Property and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consist of the following.



	December 31,
	2019			2018
Leasehold improvements	$	99,837		$	88,623
Construction in progress	4,359			2,754
Furniture and equipment	36,698			34,865
Computer equipment and software	119,904			106,318
	260,798			232,560
Accumulated depreciation	(167,126		)	(147,983		)
Property and equipment, net	$	93,672		$	84,577

Depreciation expense for property and equipment totaled $30.1 million, $26.2 million and $24.4 million during the years ended December 31, 2019, 2018 and 2017, respectively.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill

The table below summarizes the changes in the carrying amount of goodwill by reportable segment.



	Corporate Finance			FLC			Economic Consulting			Technology			Strategic Communications			Total
Balance at December 31, 2017
Goodwill	$	454,816		$	233,719		$	268,995		$	117,740		$	323,672		$	1,398,942
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2017	454,816			233,719			268,995			117,740			129,533			1,204,803
Sale of business ⁽¹⁾	—			—			—			(20,928		)	—			(20,928		)
Foreign currency translation adjustment and other	(3,819		)	(2,182		)	(448		)	(89		)	(5,021		)	(11,559		)
Balance at December 31, 2018
Goodwill	450,997			231,537			268,547			96,723			318,651			1,366,455
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2018	450,997			231,537			268,547			96,723			124,512			1,172,316
Acquisitions ⁽²⁾	27,389			—			—			—			—			27,389
Foreign currency translation adjustment and other	456			583			130			47			1,846			3,062
Balance at December 31, 2019
Goodwill	478,842			232,120			268,677			96,770			320,497			1,396,906
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2019	$	478,842		$	232,120		$	268,677		$	96,770		$	126,358		$	1,202,767


⁽¹⁾	During the year ended December 31, 2018, we sold a business within our Technology segment for proceeds of $50.3 million. We wrote off $20.9 million in goodwill as a result of the sale.


⁽²⁾	During the year ended December 31, 2019, we acquired a restructuring business that was assigned to the Corporate Finance segment. We recorded $27.4 million in goodwill based on a preliminary purchase price allocation as a result of the acquisition. We have included the results of the acquired business’s operations in the Corporate Finance segment since its acquisition date.

Other Intangible Assets

Other intangible assets were as follows:



		December 31, 2019						December 31, 2018
	Weighted Average Useful Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizing intangible assets
Customer relationships ⁽¹⁾	14.2	$	99,613	$	76,808	$	22,805	$	99,080	$	71,036	$	28,044
Trademarks ⁽¹⁾	6.0	9,855		653		9,202		—		—		—
Acquired software and other ⁽¹⁾	9.1	3,386		2,061		1,325		3,107		1,618		1,489
	13.4	112,854		79,522		33,332		102,187		72,654		29,533
Non-amortizing intangible assets
Trademarks	Indefinite	5,100		—		5,100		5,100		—		5,100
Total		$	117,954	$	79,522	$	38,432	$	107,287	$	72,654	$	34,633


⁽¹⁾	During the year ended December 31, 2019, we acquired a restructuring business and its related intangible assets that were assigned to the Corporate Finance segment.

Other intangible assets with finite lives are amortized over their estimated useful lives. We recorded amortization expense of $8.2 million, $8.2 million and $10.6 million during the years ended December 31, 2019, 2018 and 2017, respectively.

We estimate our future amortization expense for our intangible assets with a finite life to be as follows:



	As of December 31, 2019 ⁽¹⁾
Year	As of December 31, 2019 ⁽¹⁾
2020	$	9,393
2021	8,861
2022	7,028
2023	3,604
2024	2,207
Thereafter	2,239
	$	33,332

⁽¹⁾

Actual amortization expense to be reported in future periods could differ from these estimates as a result of new intangible asset acquisitions, changes in useful lives, or other relevant factors or changes.

Notes Receivable from Employees

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Notes Receivable from Employees

The table below summarizes the changes in the carrying amount of our notes receivable from employees.



	December 31,
	2019			2018
Notes receivable from employees — beginning	$	113,699		$	123,796
Notes granted	28,879			32,937
Repayments	(13,179		)	(5,405		)
Amortization	(26,294		)	(36,418		)
Cumulative translation adjustment and other	1,034			(1,211		)
Notes receivable from employees — ending	104,139			113,699
Less: current portion	(35,106		)	(29,228		)
Notes receivable from employees, net of current portion	$	69,033		$	84,471

As of December 31, 2019 and 2018, there were 303 and 294 notes outstanding, respectively. Total amortization expense for the years ended December 31, 2019, 2018 and 2017 was $26.3 million, $36.4 million and $26.8 million, respectively.

Financial Instruments

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Financial Instruments

The following table presents the carrying amounts and estimated fair values of our other financial instruments by hierarchy level as of December 31, 2019 and 2018.



	December 31, 2019
			Hierarchy Level (Fair Value)
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ^{(1) (2)}	$	14,826	$	—	$	—	$	14,826
Long-term debt ⁽³⁾	275,609		—		398,016		—
Total	$	290,435	$	—	$	398,016	$	14,826



	December 31, 2018
			Hierarchy Level (Fair Value)
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	3,698	$	—	$	—	$	3,698
Long-term debt ⁽³⁾	265,571		—		291,837		—
Total	$	269,269	$	—	$	291,837	$	3,698


⁽¹⁾	The short-term portion is included in “Accounts payable, accrued expenses and other,” and the long-term portion is included in “Other liabilities” on the Consolidated Balance Sheets.


⁽²⁾	During the year ended December 31, 2019, we acquired a restructuring business that was assigned to the Corporate Finance segment.


⁽³⁾	The carrying values include unamortized deferred debt issue costs and debt discount.

The fair value of financial instruments not included in this table are estimated to be equal to their carrying value as of December 31, 2019 and 2018.

We estimate the fair value of our 2023 Convertible Notes based on their last actively traded prices. The fair value of our debt is classified within Level 2 of the fair value hierarchy because it is traded in less active markets.

We estimate the fair value of acquisition-related contingent consideration using either a probability-weighted discounted cash flow model or a Monte Carlo simulation. These fair value estimates represent Level 3 measurements as they are based on significant inputs not observed in the market and reflect our own assumptions. We have multiple valuation models that use different inputs and assumptions based on the timing of the acquisitions. As a result, the significant unobservable inputs used in these models vary. The acquisition-related contingent consideration subject to the probability-weighted discounted cash flow model was valued using significant unobservable inputs including a discount rate of 13.5% and future cash flows. The acquisition-related contingent consideration subject to the Monte Carlo simulation was valued using significant unobservable inputs including a volatility rate of 30.0% and a discount rate of 13.6%, which reflects the weighted average of our cost of debt and adjusted cost of equity of the acquired company. Significant increases (decreases) in these unobservable inputs in isolation would result in a significantly lower (higher) fair value. We reassess the fair value of our acquisition-related contingent consideration at each reporting period based on additional information as it becomes available.

The change in our liability for acquisition-related contingent consideration for our Level 3 financial instruments is as follows:



	Liability for Acquisition-Related Contingent Consideration
Balance at December 31, 2016	$	5,692
Additions ⁽¹⁾	3,426
Accretion for time value of money ⁽²⁾	1,589
Remeasurement gain ⁽³⁾	702
Payments	(5,161		)
Transfer out	(2,498		)
Balance at December 31, 2017	$	3,750
Accretion for time value of money ⁽²⁾	479
Payments	(531		)
Balance at December 31, 2018	$	3,698
Additions ⁽¹⁾	9,746
Accretion for time value of money ⁽²⁾	2,372
Payments	(1,000		)
Foreign currency translation adjustment ⁽⁴⁾	10
Balance at December 31, 2019	$	14,826


⁽¹⁾	We acquired restructuring businesses that were assigned to the Corporate Finance segment during the years ended December 31, 2017 and 2019.


⁽²⁾	Accretion for the time value of money is included in "Selling, general and administrative expenses" on the Consolidated Statements of Comprehensive Income.


⁽³⁾	Remeasurement gain or loss resulting from a change in the fair value of an acquisition's contingent consideration liability is recorded in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income.

⁽⁴⁾

Foreign currency translation adjustments are included in "Other comprehensive income (loss), net of tax" on the Consolidated Statements of Comprehensive Income.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Debt

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Debt

The table below summarizes the components of the Company’s debt:



	December 31,
	2019			2018
2023 Convertible Notes	$	316,250		$	316,250
Total debt	316,250			316,250
Less: deferred debt discount	(35,393		)	(43,998		)
Less: deferred debt issue costs	(5,248		)	(6,681		)
Long-term debt, net ⁽¹⁾	$	275,609		$	265,571
Additional paid-in capital	$	35,306		$	35,306
Discount attribution to equity	(1,175		)	(1,175		)
Equity component, net	$	34,131		$	34,131


⁽¹⁾	There were no current portions of long-term debt as of December 31, 2019 and 2018.

2023 Convertible Notes

On August 20, 2018, we issued the 2023 Convertible Notes in an aggregate principal amount of $316.3 million. The 2023 Convertible Notes bear interest at a fixed rate of 2.0% per year, payable semiannually in arrears on February 15 and August 15 of each year, and will mature on August 15, 2023, unless earlier converted or repurchased. The 2023 Convertible Notes are senior unsecured obligations of the Company.

The 2023 Convertible Notes are convertible at an initial conversion rate of 9.8643 shares of our common stock per $1,000 principal amount of the 2023 Convertible Notes (equivalent to an initial conversion price of approximately $101.38 per share of common stock). Holders may convert their 2023 Convertible Notes at any time prior to the close of business on the business day immediately preceding May 15, 2023 only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2018 (and only during such calendar quarter), if the last reported sale price of our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “Measurement Period”) in which the trading price (as defined in the indenture governing the 2023 Convertible Notes) per $1,000 principal amount of the 2023 Convertible Notes for each trading day of the Measurement Period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate in effect on each such trading day; or (3) upon the occurrence of specified corporate events. On or after May 15, 2023, until the close of business on the business day immediately preceding the maturity date of August 15, 2023, holders may convert their 2023 Convertible Notes at any time, regardless of the foregoing circumstances. The circumstances required to allow the holders to convert their 2023 Convertible Notes were not met as of December 31, 2019.

If we undergo a fundamental change (as defined in the indenture governing the 2023 Convertible Notes), subject to certain conditions, holders may require us to repurchase for cash all or part of their 2023 Convertible Notes.

The debt discount is amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method.

We incurred debt issue costs and allocated the total amount to the liability and equity components of the 2023 Convertible Notes based on their relative values. The debt issue costs attributable to the liability component are amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method. Issuance costs attributable to the equity component were netted with the equity component in stockholders' equity.

The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes:



	December 31,
	2019		2018
Contractual interest expense	$	6,325	$	2,302
Amortization of debt discount ⁽¹⁾	8,606		3,018
Total	$	14,931	$	5,320

⁽¹⁾The effective interest rate of the liability component was 5.45%.

2022 Notes

On November 15, 2018, we redeemed the $300.0 million outstanding principal amount of our 6.0% senior notes due 2022 ("2022 Notes"), pursuant to the terms of the indenture governing the 2022 Notes. We recognized a loss on early extinguishment of debt of $9.1 million, consisting primarily of a redemption premium of $6.0 million and a $3.1 million non-cash write-off of unamortized deferred financing costs. This loss has been recorded in “Loss on early extinguishment of debt” within the Consolidated Statements of Comprehensive Income.

Credit Facility

On June 26, 2015, we entered into a credit agreement, which provides for a $550.0 million senior secured revolving credit facility ("Original Credit Facility") maturing on June 26, 2020. In November 2018, we amended and restated the credit agreement to the Original Credit Facility, to, among other things, extend the maturity to November 30, 2023 and incurred an additional $1.7 million of debt issuance costs (the Original Credit Facility as amended and restated, the “Credit Facility”). At the Company’s option, borrowings under the Credit Facility in USD, euro and British pound will bear interest at either one-, two- or three-month London Interbank Offered Rate ("LIBOR") or an alternative base rate, in each case plus the applicable margin. The applicable margin will fluctuate between 1.25% per annum and 2.00% per annum, in the case of LIBOR borrowings, or between 0.25% per annum and 1.00% per annum, in the case of base rate borrowings, in each case, based upon the Company’s Consolidated Total Net Leverage Ratio (as defined in the Credit Facility) at such time. The lenders have a security interest in substantially all of the assets of the Company and substantially all of its domestic subsidiaries.

Under the Credit Facility, we are required to pay a commitment fee rate that fluctuates between 0.20% and 0.35% per annum and a letter of credit fee rate that fluctuates between 1.25% and 2.00% per annum, in each case, based upon the Company’s Consolidated Total Net Leverage Ratio.

There were no borrowings outstanding under the Credit Facility as of December 31, 2019 and 2018. Additionally, $1.0 million of the borrowing limit was used (and, therefore, unavailable) as of December 31, 2019 for letters of credit.

There were $2.0 million and $3.6 million of unamortized debt issue costs related to the Credit Facility as of December 31, 2019 and 2018, respectively. These amounts were included in “Other assets” on our Consolidated Balance Sheets.

Leases (Notes)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Leases

We lease office space and equipment under non-cancelable operating leases. We recognize operating lease expense on a straight-line basis over the lease term. Leases with an initial term of 12 months or less are not recorded on the balance sheet and are expensed on a straight-line basis. Most leases include one or more options to renew, with renewal terms that can extend the lease term from six months to seven years. The exercise of lease renewal options is at our sole discretion. Certain of our lease agreements include rental payments that are adjusted periodically for inflation. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants.

The table below summarizes the carrying amount of our operating lease assets and liabilities:



		As of
Leases	Classification	December 31, 2019
Assets
Operating lease assets	Operating lease assets	$	159,777
Total lease assets		$	159,777
Liabilities
Current
Operating lease liabilities	Accounts payable, accrued expenses and other	$	35,727
Noncurrent
Operating lease liabilities	Noncurrent operating lease liabilities	176,378
Total lease liabilities		$	212,105

The table below summarizes total lease costs for the year ended December 31, 2019:



	Year Ended December 31,
Lease Cost	2019
Operating lease costs	$	45,144
Short-term lease costs	3,173
Variable lease costs	11,962
Sublease income	(5,015		)
Total lease cost	$	55,264

We sublease certain of our leased office spaces to third parties. Our sublease portfolio consists of leases of office space that we have vacated before the lease term expiration. Operating lease expense on vacated office space is reduced by sublease rental income, which is recorded to selling, general and administrative (“SG&A”) expenses on the Consolidated Statements of Comprehensive Income. Our sublease arrangements do not contain renewal options or restrictive covenants. We estimate future sublease rental income to be $4.9 million in 2020, $4.5 million in 2021, $0.7 million in 2022, $0.6 million in 2023, $0.6 million in 2024 and $0.3 million in years beyond 2024.

The maturity analysis below summarizes the remaining future undiscounted cash flows for our operating leases, a reconciliation to operating lease liabilities reported on the Consolidated Balance Sheets, our weighted average remaining lease term and weighted average discount rate:



	As of
	December 31, 2019
2020	$	45,849
2021	51,331
2022	32,194
2023	26,896
2024	23,654
Thereafter	77,162
Total future lease payments	257,086
Less: imputed interest	(44,981		)
Total	$	212,105

Weighted average remaining lease term (years)
Operating leases	6.5

Weighted average discount rate
Operating leases	5.6		%

The table below summarizes cash paid for our operating lease liabilities and other non-cash information:



	Year Ended December 31,
	2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	46,079

Operating lease assets obtained in exchange for lease liabilities	$	37,774

Operating Lease Commitments

Under ASC 840, Leases, our future minimum payments for all operating lease obligations that have initial non-cancelable lease terms exceeding one year, net of rental income from subleases as of December 31, 2018, were as follows:



	Operating Leases		Sublease Rental Income
	Operating Leases		Sublease Rental Income
2019	$	49,757	$	4,760
2020	47,084		3,944
2021	44,480		3,864
2022	24,471		707
2023	20,309		614
Thereafter	75,190		939
Total	$	261,291	$	14,828

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are subject to legal actions arising in the ordinary course of business. In management’s opinion, we believe we have adequate legal defenses and/or insurance coverage with respect to the eventuality of such actions. We do not believe any settlement or judgment relating to any pending legal action would materially affect our financial position or results of operations.

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

On December 22, 2017, the 2017 U.S. Tax Cuts and Jobs Act (the “2017 Tax Act”) was signed into law. The 2017 Tax Act included a number of changes to the U.S. Internal Revenue Code, including a reduction of the U.S. corporate income tax

rate from 35% to 21% for tax years beginning after December 31, 2017, and a one-time transition tax on certain unrepatriated foreign earnings (the “Transition Tax”). Prospective changes from the 2017 Tax Act that began in 2018 include imposed limitations on the deductibility of executive compensation and interest, a general elimination of U.S. federal income taxes on dividends from foreign subsidiaries, and a new provision designed to tax global intangible low-taxed income ("GILTI"). The Company has made an accounting policy election to account for the tax effects of the GILTI provision as a period cost.

The table below summarizes significant components of deferred tax assets and liabilities.



	Year Ended December 31,
	2019			2018
Deferred tax assets
Allowance for doubtful accounts	$	13,041		$	11,792
Accrued vacation and bonus	27,438			23,545
Deferred rent	—			9,016
Share-based compensation	12,647			11,837
Notes receivable from employees	12,187			12,993
State net operating loss carryforward	2,066			3,510
Foreign net operating loss carryforward	9,388			9,857
Federal tax credit and capital loss carryforward	7,336			9,470
Deferred compensation	2,117			1,801
Operating lease assets	43,397			—
Employee benefits obligations	1,191			943
Other, net	1,898			186
Total deferred tax assets	132,706			94,950
Deferred tax liabilities
Revenue recognition	(6,732		)	(5,087		)
Operating lease liabilities	(29,671		)	—
Property and equipment, net	(3,797		)	(6,652		)
Equity debt discount	(8,890		)	(11,014		)
Goodwill and other intangible assets	(209,250		)	(199,964		)
Total deferred tax liabilities	(258,340		)	(222,717		)
Foreign withholding tax	(1,195		)	(413		)
Valuation allowance	(19,865		)	(21,929		)
Net deferred tax liabilities	$	(146,694	)	$	(150,109	)

As of December 31, 2019 and 2018, the Company recorded certain deferred tax assets related to foreign tax credits, capital losses and foreign net operating loss carryforwards, which can be carried forward for periods ranging from 10 years to indefinite. Based on forward-looking financial information, the Company believes it is not more likely than not that the attributes will be utilized. Therefore, valuation allowances of $19.9 million and $21.9 million are recorded against the Company’s deferred tax assets as of December 31, 2019 and 2018, respectively.

As of December 31, 2019, the Company has not recorded a $22.9 million deferred tax liability related to the basis difference in the investment in our foreign subsidiaries, as the investment is considered permanent in nature.

The table below summarizes the components of income before income tax provision (benefit) from continuing operations.



	Year Ended December 31,
	2019		2018		2017
Domestic	$	150,860	$	96,543	$	30,013
Foreign	137,590		111,249		57,092
Total	$	288,450	$	207,792	$	87,105

The table below summarizes the components of income tax provision (benefit) from continuing operations.



	Year Ended December 31,
	2019			2018		2017
Current
Federal	$	30,651		$	10,847	$	15,164
State	7,702			4,447		742
Foreign	37,083			21,056		14,816
	75,436			36,350		30,722
Deferred
Federal	(1,767		)	14,538		(47,820		)
State	785			503		(152		)
Foreign	(2,730		)	5,790		(3,607		)
	(3,712		)	20,831		(51,579		)
Income tax provision (benefit)	$	71,724		$	57,181	$	(20,857	)

Our income tax provision (benefit) from continuing operations resulted in effective tax rates that varied from the statutory federal income tax rate as summarized below.



	Year Ended December 31,
	2019			2018			2017
Income tax expense at federal statutory rate	$	60,575		$	43,636		$	30,487
State income taxes, net of federal benefit	8,430			4,950			781
Detriment (benefit) from foreign tax rates	3,425			3,655			(8,500		)
Valuation allowance on foreign net operating loss carryforward	260			(450		)	253
Other expenses not deductible for tax purposes	4,362			3,543			2,466
Adjustment to reserve for uncertain tax positions	2,504			(132		)	456
Impact of 2017 U.S. tax reform — deferred tax	—			(706		)	(63,525		)
Impact of 2017 U.S. tax reform — Transition Tax	(1,088		)	50			18,655
Sale of Ringtail business	(2,097		)	3,798			—
Equity-based compensation	(4,447		)	(1,371		)	809
Other adjustments, net	(200		)	208			(2,739		)
Income tax provision (benefit)	$	71,724		$	57,181		$	(20,857	)

The income tax expense for the years ended December 31, 2019 and 2018 was $71.7 million and $57.2 million, respectively. The increase in expense is primarily attributable to higher pre-tax income in 2019 as compared with 2018.

We file numerous consolidated and separate income tax returns in the U.S. federal jurisdiction and in many city, state and foreign jurisdictions. We are no longer subject to U.S. federal income tax examinations for years prior to 2015. We are also no longer subject to state and local or foreign tax examinations by tax authorities for years prior to 2013.

Our liability for uncertain tax positions was $11.1 million and $3.7 million as of December 31, 2019 and 2018, respectively. The Company does not expect any of the uncertain tax positions to settle within the next 12 months. As of December 31, 2019, our accrual for the payment of tax-related interest and penalties was not significant.

Stockholders' Equity

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

2016 Stock Repurchase Program

On June 2, 2016, our Board of Directors authorized a stock repurchase program of up to $100.0 million (the “Repurchase Program”). On each of May 18, 2017, December 1, 2017 and February 21, 2019, our Board of Directors authorized an additional $100.0 million, respectively, increasing the Repurchase Program to an aggregate authorization of $400.0 million. No time limit has been established for the completion of the Repurchase Program and the Repurchase Program may be suspended, discontinued or replaced by the Board of Directors at any time without prior notice. As of December 31, 2019, we have $66.6 million available under this program to repurchase additional shares.

The following table details our stock repurchases under the Repurchase Program:



	Year Ended December 31,
	2019		2018		2017
Shares of common stock repurchased and retired	1,258		756		4,674
Average price per share	$	84.16	$	53.88	$	35.94
Total cost	$	105,915	$	40,722	$	168,001

2018 Repurchase Transaction

On August 13, 2018, our Board of Directors authorized the use of a portion of the proceeds from the issuance of the 2023 Convertible Notes to repurchase up to $25.0 million of common stock. On August 16, 2018, 196,050 shares of our common stock were repurchased at $76.51 per share for a total cost of $15.0 million. This is a separate repurchase transaction outside of the Repurchase Program.

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2019
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We maintain a qualified defined contribution 401(k) plan, which covers substantially all of our U.S. employees. Under the plan, participants are entitled to make pre-tax and/or Roth post-tax contributions up to the annual maximums established by the Internal Revenue Service. We match a certain percentage of participant contributions pursuant to the terms of the plan, which contributions are limited to a percentage of the participant’s eligible compensation. Effective in 2018, we increased our matching percentage. We made contributions related to the plan of $17.4 million, $15.2 million and $11.6 million during the years ended December 31, 2019, 2018 and 2017, respectively. We also maintain several defined contribution pension plans for our employees in the United Kingdom and other foreign countries. We contributed to these plans $7.3 million, $7.7 million and $6.4 million during the years ended December 31, 2019, 2018 and 2017, respectively.

Segment Reporting

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Segment Reporting

We manage our business in five reportable segments: Corporate Finance, FLC, Economic Consulting, Technology and Strategic Communications.

Our Corporate Finance segment focuses on the strategic, operational, financial, transactional and capital needs of our clients around the world and delivers a wide range of service offerings related to restructuring, business transformation and transactions. Our restructuring practice includes corporate restructuring, including bankruptcy and interim management services. Our business transformation and transactions practices include financial, operational and performance improvement services, as well as due diligence, financing advisory, mergers and acquisitions ("M&A") advisory, M&A integration, carveout support and valuations.

Our FLC segment provides law firms, companies, government clients and other interested parties with multidisciplinary and independent services related to risk advisory, investigations and disputes. We have expertise in anti-corruption/anti-money laundering investigations and compliance, cybersecurity, data analytics, export controls and sanctions, and monitorship. We offer specialized industry expertise in the areas of insurance, construction, healthcare, environmental and trial services.

Our Economic Consulting segment provides law firms, companies, government entities and other interested parties with analysis of complex economic issues for use in legal, regulatory and international arbitration proceedings, strategic decision making and public policy debates in the U.S. and around the world.

Our Technology segment provides companies and law firms with a comprehensive and global portfolio of consulting and services for information governance, privacy and security, electronic discovery and insight analytics. Our consulting expertise enables clients to more confidently govern, secure, find, analyze and rapidly understand their data in the context of compliance and risk.

Our Strategic Communications segment designs and executes communications strategies for CEOs, management teams and boards of directors that help them seize opportunities, manage financial, regulatory and reputational challenges, navigate market disruptions, articulate their corporate brand, stake a competitive position, and preserve their freedom to operate.

We evaluate the performance of our operating segments based on Adjusted Segment EBITDA, a GAAP financial measure. We define Adjusted Segment EBITDA as a segment’

The table below presents revenues and Adjusted Segment EBITDA for our reportable segments for the years ended December 31, 2019, 2018 and 2017.



	Year Ended December 31,
	2019		2018		2017
Revenues
Corporate Finance	$	723,721	$	564,479	$	482,041
FLC	577,780		520,333		462,324
Economic Consulting	592,542		533,979		496,029
Technology	215,584		185,755		174,850
Strategic Communications	243,090		223,331		192,488
Total revenues	$	2,352,717	$	2,027,877	$	1,807,732
Adjusted Segment EBITDA
Corporate Finance	$	160,735	$	121,660	$	82,863
FLC	104,435		96,821		72,705
Economic Consulting	84,112		69,955		61,964
Technology	45,688		27,387		22,171
Strategic Communications	44,544		42,918		27,732
Total Adjusted Segment EBITDA	$	439,514	$	358,741	$	267,435

The table below reconciles net income to Total Adjusted Segment EBITDA. Unallocated corporate expenses primarily include indirect costs related to centrally managed administrative functions that have not been allocated to the segments. These administrative costs include costs related to executive management, legal, corporate office support costs, information technology, accounting, marketing, human resources and company-wide business development and strategy functions.



	Year Ended December 31,
	2019			2018			2017
Net income	$	216,726		$	150,611		$	107,962
Add back:
Income tax provision (benefit)	71,724			57,181			(20,857		)
Interest income and other	(2,061		)	(4,977		)	(3,752		)
Interest expense	19,206			27,149			25,358
Gain on sale of business	—			(13,031		)	—
Loss on early extinguishment of debt	—			9,072			—
Unallocated corporate expenses	98,398			96,595			83,140
Segment depreciation expense	27,369			27,979			27,112
Amortization of intangible assets	8,152			8,162			10,563
Segment special charges	—			—			37,207
Remeasurement of acquisition-related contingent consideration	—			—			702
Total Adjusted Segment EBITDA	$	439,514		$	358,741		$	267,435

The table below presents assets by segment. Segment assets primarily include accounts and notes receivable, fixed assets purchased specifically for the segment, goodwill and other intangible assets.



	December 31,
	2019		2018
Corporate Finance	$	814,820	$	707,924
FLC	462,155		412,667
Economic Consulting	543,475		516,123
Technology	200,430		171,002
Strategic Communications	217,129		212,147
Total segment assets	2,238,009		2,019,863
Unallocated corporate assets	545,133		359,258
Total assets	$	2,783,142	$	2,379,121

The table below details information on our revenues for the years ended December 31, 2019, 2018 and 2017. Revenues have been attributed to locations based on the location of the legal entity generating the revenues.



	Year Ended December 31,
	2019		2018		2017
U.S.	$	1,555,133	$	1,372,116	$	1,262,682
United Kingdom	389,338		302,576		251,843
All other foreign countries	408,246		353,185		293,207
Total revenues	$	2,352,717	$	2,027,877	$	1,807,732

We do not have a single customer that represents 10% or more of our consolidated revenues.

The table below details information on our long-lived assets and net assets by geographic location, which is based on the location of the legal entity holding the assets. We define net assets as total assets less total liabilities.



	December 31, 2019						December 31, 2018
	U.S.		United Kingdom		All Other Foreign Countries		U.S.		United Kingdom		All Other Foreign Countries
Property and equipment, net	$	63,563	$	16,423	$	13,686	$	59,611	$	14,023	$	10,943
Net assets	$	925,288	$	196,087	$	367,767	$	867,321	$	160,894	$	320,610

Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (unaudited)



	Quarter Ended
	March 31			June 30			September 30			December 31
2019
Revenues	$	551,274		$	606,119		$	593,106		$	602,218
Operating expenses
Direct cost of revenues	349,066			386,266			380,892			418,672
Selling, general and administrative expenses	113,185			129,906			127,951			133,032
Amortization of other intangible assets	1,861			1,852			2,125			2,314
	464,112			518,024			510,968			554,018
Operating income	87,162			88,095			82,138			48,200
Interest income and other	159			2,609			2,973			(3,680		)
Interest expense	(4,746		)	(4,793		)	(4,832		)	(4,835		)
Income before income tax provision	82,575			85,911			80,279			39,685
Income tax provision	19,930			21,313			19,857			10,624
Net income	$	62,645		$	64,598		$	60,422		$	29,061
Earnings per common share — basic ⁽¹⁾	$	1.69		$	1.75		$	1.65		$	0.80
Earnings per common share — diluted ⁽¹⁾	$	1.64		$	1.69		$	1.59		$	0.76
Weighted average common shares outstanding
Basic	36,981			36,960			36,617			36,545
Diluted	38,219			38,168			37,938			38,126



	Quarter Ended
	March 31			June 30			September 30			December 31
2018
Revenues	$	497,774		$	512,098		$	513,012		$	504,993
Operating expenses
Direct cost of revenues	321,117			330,318			336,477			340,162
Selling, general and administrative expenses	112,128			117,897			117,448			118,163
Amortization of other intangible assets	2,270			2,052			1,975			1,865
	435,515			450,267			455,900			460,190
Operating income	62,259			61,831			57,112			44,803
Interest income and other	(1,800		)	2,474			1,400			2,903
Interest expense	(6,244		)	(6,583		)	(7,246		)	(7,076		)
Gain on sale of business	—			—			13,031			—
Loss on early extinguishment of debt	—			—			—			(9,072		)
Income before income tax provision	54,215			57,722			64,297			31,558
Income tax provision	15,270			14,113			19,964			7,834
Net income	$	38,945		$	43,609		$	44,333		$	23,724
Earnings per common share — basic ⁽¹⁾	$	1.06		$	1.18		$	1.19		$	0.63
Earnings per common share — diluted ⁽¹⁾	$	1.04		$	1.14		$	1.14		$	0.61
Weighted average common shares outstanding
Basic	36,700			37,001			37,318			37,368
Diluted	37,612			38,271			38,756			38,628

⁽¹⁾

The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2019

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II - Valuation and Qualifying Accounts

Schedule II — Valuation and Qualifying Accounts

(in thousands)



	Balance at Beginning of Period		Additions						Balance at End of Period
			Charged to Expense		Charged to Other Accounts*
Description			Charged to Expense		Charged to Other Accounts*		Deductions**
Year Ended December 31, 2019
Reserves and allowances deducted from asset accounts:
Allowance for doubtful accounts and unbilled services	$	202,394	$	19,602	$	56,238	$	12,734	$	265,500
Valuation allowance for deferred tax asset	$	21,929	$	—	$	—	$	2,064	$	19,865
Year Ended December 31, 2018
Reserves and allowances deducted from asset accounts:
Allowance for doubtful accounts and unbilled services	$	180,687	$	17,872	$	25,300	$	21,465	$	202,394
Valuation allowance for deferred tax asset	$	21,621	$	308	$	—	$	—	$	21,929
Year Ended December 31, 2017
Reserves and allowances deducted from asset accounts:
Allowance for doubtful accounts and unbilled services	$	178,819	$	15,386	$	9,656	$	23,174	$	180,687
Valuation allowance for deferred tax asset	$	18,900	$	2,721	$	—	$	—	$	21,621

* Includes estimated provision for unbilled services recorded as a reduction to revenues (i.e., fee, rate and other adjustments).

** Includes estimated direct write-offs of uncollectible and unrealizable accounts receivable.

Description of Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Accounting Principles

Foreign Currency

Use of Estimates

Concentrations of Risk

Revenues

Revenue Recognition

We generate the majority of our revenues by providing consulting services to our clients. Most of our consulting service contracts are based on one of the following types of arrangements:

•


•	Fixed-fee arrangements require the client to pay a pre-established fee in exchange for a predetermined set of professional services. We recognize revenues for these arrangements based on the proportional performance related to individual performance obligations within each arrangement; however, these arrangements generally have one performance obligation.


•	Performance-based or contingent arrangements represent forms of variable consideration. In these arrangements, our fees are based on the attainment of contractually defined objectives with our client, such as completing a business transaction or assisting the client in achieving a specific business objective. We recognize revenues earned to date by applying the proportional performance method.

Direct Cost of Revenues

Share-Based Compensation

For all our share-based awards, we recognize forfeitures in compensation cost when they occur

Advertising Costs

Advertising costs consist of marketing, advertising through print and other media, professional event sponsorship and public relations. These costs are expensed as incurred.

Income Taxes

Cash Equivalents

Cash equivalents consist of money market funds, commercial paper and certificates of deposit with maturities of three months or less at the time of purchase.

Allowance for Doubtful Accounts and Unbilled Services

Property and Equipment

Notes Receivable from Employees

Goodwill and Other Intangible Assets


•	significant underperformance relative to expected historical or projected future operating results;


•	a significant change in the manner of our use of the acquired asset or the strategy for our overall business;


•	a significant market decline related to negative industry or economic trends; and/or


•	our market capitalization relative to net carrying value.

Impairment of Long-Lived Assets

Leases

Billings in Excess of Services Provided

New Accounting Standards

Recently Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers. On January 1, 2018, we adopted ASC 606 using the modified retrospective method and recorded an immaterial cumulative effect adjustment to the beginning balance of retained earnings for revenue contracts that existed at the adoption date. Under the modified retrospective method, prior year information has not been adjusted and continues to be reported under the accounting standards in effect for periods prior to the adoption date. We have not retroactively restated the existing contracts for modifications that occurred before January 1, 2018.

See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies and methods used in preparation of the Consolidated Financial Statements. See Note 4, “Revenues” for the disclosures required under ASC 606. The adoption of ASC 606 had an immaterial impact on our Consolidated Statements of Comprehensive Income and Consolidated Balance Sheets and had no impact on our Consolidated Statements of Cash Flows.

In February 2016, the FASB issued ASU 2016-02, Leases, which was amended in some respects by subsequent ASUs. We adopted ASC 842 using the modified retrospective basis for reporting. In addition, we elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed us to carry forward the historical lease classification for existing leases on the adoption date, and allowed us not to reassess whether an existing contract contains a lease or initial direct costs. As permitted by the guidance, prior comparative periods will not be adjusted under this method.

See Note 1, "Description of Business and Summary of Significant Accounting Policies" for a description of the significant accounting policies for our operating leases. See Note 14, "Leases" for the disclosures required under ASC 842. The adoption of this standard resulted in recognition of operating lease assets in the amount of $148.5 million and lease liabilities in the amount of $206.7 million for operating leases on our Consolidated Balance Sheets as of January 1, 2019. Our existing deferred rent and cease-use liabilities were $62.3 million as of December 31, 2018 and were included as a reduction to the initial measurement of our operating lease assets. Our existing prepaid rent balance was $4.1 million as of December 31, 2018 and was included as a reduction to the initial measurement of our operating lease liabilities. There was no material impact on the Consolidated Statements of Comprehensive Income, Consolidated Statements of Stockholders’ Equity or Consolidated Statements of Cash Flows.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement, which eliminates, adds and modifies certain disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes to the financial statements and is effective for annual and interim periods beginning after December 15, 2019. We elected, as permitted by the standard, to early adopt ASU 2018-13 as of December 31, 2019 and have prospectively applied the modifications which are limited to presentation and disclosure changes that did not have a material impact on the consolidated financial statements.

Accounting Standards Not Yet Adopted

In August 2018, the FASB issued ASU 2018-15, Internal Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract, which requires the Company to capitalize implementation costs of a hosting arrangement that is a service contract and expense those costs over the term of the hosting arrangement. The guidance is effective for annual and interim periods beginning after December 15, 2019 although early adoption is permitted. The Company is in the process of evaluating the impact of this new guidance on its consolidated financial statements.

Earnings per Common Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Basic and Diluted



	Year Ended December 31,
	2019		2018		2017
Numerator — basic and diluted
Net income	$	216,726	$	150,611	$	107,962
Denominator
Weighted average number of common shares outstanding — basic	36,774		37,098		38,697
Effect of dilutive convertible notes	62		—		—
Effect of dilutive stock options	455		491		117
Effect of dilutive restricted shares	820		729		378
Weighted average number of common shares outstanding — diluted	38,111		38,318		39,192
Earnings per common share — basic	$	5.89	$	4.06	$	2.79
Earnings per common share — diluted	$	5.69	$	3.93	$	2.75
Antidilutive stock options and restricted shares	19		175		1,561

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Share-Based Compensation Expense

The table below reflects the total share-based compensation expense recognized in our Consolidated Statements of Comprehensive Income for the years ended December 31, 2019, 2018 and 2017.



	2019				2018				2017
			Restricted				Restricted				Restricted
Income Statement Classification	Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾
Direct cost of revenues	$	497	$	11,869	$	780	$	9,804	$	370	$	9,691
Selling, general and administrative expenses	2,628		9,005		2,027		8,191		1,207		4,870
Special charges	—		—		—		—		—		269
Total	$	3,125	$	20,874	$	2,807	$	17,995	$	1,577	$	14,830


⁽¹⁾	Includes options and cash-settled stock appreciation rights.


⁽²⁾	Includes restricted share awards, restricted stock units, performance stock units and cash-settled restricted stock units.

Schedule of Stock Option and Grants Using Valuation Assumptions



		Year Ended December 31,
Assumptions		2017
Risk-free interest rate		1.60%
Dividend yield		—%
Expected term		3 years
Stock price volatility		31.94%

Schedule of Stock Option Activity



	Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
Stock options outstanding at December 31, 2018	935		$	36.50
Stock options granted	—		N/A
Stock options exercised	(256	)	$	37.88
Stock options forfeited	(1	)	$	30.28
Stock options outstanding at December 31, 2019	678		$	35.98	4.7	$	50,669
Stock options exercisable at December 31, 2019	605		$	35.75	4.6	$	45,343

Schedule of Stock Options Outstanding and Exercisable

The following is a summary of stock options outstanding and exercisable as of December 31, 2019.



	Options Outstanding				Options Exercisable
		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)		Weighted Average Exercise Price
Exercise Price Range	Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (in Years)	Shares	Weighted Average Exercise Price
$26.68-$33.95	137	$	31.46	3.7	124	$	31.53
$34.33-$34.62	138	$	34.40	5.4	138	$	34.40
$35.73-$36.87	195	$	36.67	4.4	188	$	36.68
$36.89-$40.36	202	$	39.28	5.4	149	$	39.12
$41.69-$41.69	6	$	41.69	0.3	6	$	41.69
	678				605

Schedule of Unvested Restricted Share Activity

A summary of our restricted share activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2018	992		$	43.76
Restricted share awards granted	222		$	81.64
Restricted share awards vested	(229	)	$	43.04
Restricted share awards forfeited	(28	)	$	38.87
Unvested restricted share awards outstanding at December 31, 2019	957		$	52.86

Schedule of Restricted Stock Unit Activity

A summary of our restricted stock units activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Restricted stock units outstanding at December 31, 2018	335		$	39.72
Restricted stock units granted	30		$	82.39
Restricted stock units released	(52	)	$	42.15
Restricted stock units forfeited	—		N/A
Restricted stock units outstanding at December 31, 2019	313		$	43.45

Schedule of Performance Stock Units Activity

A summary of our performance stock units activity during the year ended December 31, 2019 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Performance stock units outstanding at December 31, 2018	275		$	42.60
Performance stock units granted ⁽¹⁾	170		$	77.67
Performance stock units released	(84	)	$	35.75
Performance stock units forfeited	—		N/A
Performance stock units outstanding at December 31, 2019	361		$	60.67

⁽¹⁾

Performance stock units granted are presented at the maximum potential payout percentage of 150% of target shares granted.

Schedule of Weighted-Average Grant Date Fair Value Per Share of Stock Options, Restricted Share Awards, Restricted Stock Units and Performance Stock Units Awarded



	Year Ended December 31,
	2019		2018		2017
Weighted average fair value of grants
Stock options	$	—	$	—	$	9.56
Restricted share awards, restricted stock units and performance stock units	$	80.10	$	51.73	$	38.88

Interest Income and Other (Tables)

12 Months Ended

Dec. 31, 2019

Other Income and Expenses [Abstract]

Schedule of Interest Income and Other

The table below presents the components of “Interest income and other” as shown on the Consolidated Statements of Comprehensive Income.



	Year Ended December 31,
Interest Income and Other	2019			2018			2017
Interest income	$	4,761		$	5,448		$	3,968
Foreign exchange transaction gains (losses), net	(3,056		)	261			(77		)
Other	356			(732		)	(139		)
Total	$	2,061		$	4,977		$	3,752

Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule Of Balance Sheet Details



	December 31,
	2019		2018
Prepaid expenses and other current assets
Prepaid expenses	$	39,740	$	35,762
Income tax receivable	8,161		18,947
Other current assets	32,909		14,739
Total	$	80,810	$	69,448
Accounts payable, accrued expenses and other
Accounts payable	$	18,346	$	17,728
Accrued expenses	46,511		52,461
Accrued interest payable	2,243		2,358
Accrued taxes payable	35,895		13,119
Current operating lease liabilities	35,727		—
Other current liabilities	20,214		18,934
Total	$	158,936	$	104,600

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and equipment consist of the following.



	December 31,
	2019			2018
Leasehold improvements	$	99,837		$	88,623
Construction in progress	4,359			2,754
Furniture and equipment	36,698			34,865
Computer equipment and software	119,904			106,318
	260,798			232,560
Accumulated depreciation	(167,126		)	(147,983		)
Property and equipment, net	$	93,672		$	84,577

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in Carrying Amounts of Goodwill by Operating Segment

The table below summarizes the changes in the carrying amount of goodwill by reportable segment.



	Corporate Finance			FLC			Economic Consulting			Technology			Strategic Communications			Total
Balance at December 31, 2017
Goodwill	$	454,816		$	233,719		$	268,995		$	117,740		$	323,672		$	1,398,942
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2017	454,816			233,719			268,995			117,740			129,533			1,204,803
Sale of business ⁽¹⁾	—			—			—			(20,928		)	—			(20,928		)
Foreign currency translation adjustment and other	(3,819		)	(2,182		)	(448		)	(89		)	(5,021		)	(11,559		)
Balance at December 31, 2018
Goodwill	450,997			231,537			268,547			96,723			318,651			1,366,455
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2018	450,997			231,537			268,547			96,723			124,512			1,172,316
Acquisitions ⁽²⁾	27,389			—			—			—			—			27,389
Foreign currency translation adjustment and other	456			583			130			47			1,846			3,062
Balance at December 31, 2019
Goodwill	478,842			232,120			268,677			96,770			320,497			1,396,906
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2019	$	478,842		$	232,120		$	268,677		$	96,770		$	126,358		$	1,202,767


⁽¹⁾	During the year ended December 31, 2018, we sold a business within our Technology segment for proceeds of $50.3 million. We wrote off $20.9 million in goodwill as a result of the sale.

⁽²⁾

During the year ended December 31, 2019, we acquired a restructuring business that was assigned to the Corporate Finance segment. We recorded $27.4 million in goodwill based on a preliminary purchase price allocation as a result of the acquisition. We have included the results of the acquired business’s operations in the Corporate Finance segment since its acquisition date.

Schedule of Other Intangible Assets Amortized Intangibles

Other intangible assets were as follows:



		December 31, 2019						December 31, 2018
	Weighted Average Useful Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizing intangible assets
Customer relationships ⁽¹⁾	14.2	$	99,613	$	76,808	$	22,805	$	99,080	$	71,036	$	28,044
Trademarks ⁽¹⁾	6.0	9,855		653		9,202		—		—		—
Acquired software and other ⁽¹⁾	9.1	3,386		2,061		1,325		3,107		1,618		1,489
	13.4	112,854		79,522		33,332		102,187		72,654		29,533
Non-amortizing intangible assets
Trademarks	Indefinite	5,100		—		5,100		5,100		—		5,100
Total		$	117,954	$	79,522	$	38,432	$	107,287	$	72,654	$	34,633

⁽¹⁾

During the year ended December 31, 2019, we acquired a restructuring business and its related intangible assets that were assigned to the Corporate Finance segment.

Schedule of Other Intangible Assets Unamortized Intangibles

Other intangible assets were as follows:



		December 31, 2019						December 31, 2018
	Weighted Average Useful Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizing intangible assets
Customer relationships ⁽¹⁾	14.2	$	99,613	$	76,808	$	22,805	$	99,080	$	71,036	$	28,044
Trademarks ⁽¹⁾	6.0	9,855		653		9,202		—		—		—
Acquired software and other ⁽¹⁾	9.1	3,386		2,061		1,325		3,107		1,618		1,489
	13.4	112,854		79,522		33,332		102,187		72,654		29,533
Non-amortizing intangible assets
Trademarks	Indefinite	5,100		—		5,100		5,100		—		5,100
Total		$	117,954	$	79,522	$	38,432	$	107,287	$	72,654	$	34,633

⁽¹⁾

During the year ended December 31, 2019, we acquired a restructuring business and its related intangible assets that were assigned to the Corporate Finance segment.

Schedule of Future Amortization Expense Intangible Assets

We estimate our future amortization expense for our intangible assets with a finite life to be as follows:



	As of December 31, 2019 ⁽¹⁾
Year	As of December 31, 2019 ⁽¹⁾
2020	$	9,393
2021	8,861
2022	7,028
2023	3,604
2024	2,207
Thereafter	2,239
	$	33,332

⁽¹⁾

Notes Receivable from Employees (Tables)

12 Months Ended

Dec. 31, 2019

Receivables [Abstract]

Summary of Changes in Carrying Amount of Notes Receivable From Employees

The table below summarizes the changes in the carrying amount of our notes receivable from employees.



	December 31,
	2019			2018
Notes receivable from employees — beginning	$	113,699		$	123,796
Notes granted	28,879			32,937
Repayments	(13,179		)	(5,405		)
Amortization	(26,294		)	(36,418		)
Cumulative translation adjustment and other	1,034			(1,211		)
Notes receivable from employees — ending	104,139			113,699
Less: current portion	(35,106		)	(29,228		)
Notes receivable from employees, net of current portion	$	69,033		$	84,471

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Carrying and Estimated Fair Value of Other Financial Instruments

The following table presents the carrying amounts and estimated fair values of our other financial instruments by hierarchy level as of December 31, 2019 and 2018.



	December 31, 2019
			Hierarchy Level (Fair Value)
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ^{(1) (2)}	$	14,826	$	—	$	—	$	14,826
Long-term debt ⁽³⁾	275,609		—		398,016		—
Total	$	290,435	$	—	$	398,016	$	14,826



	December 31, 2018
			Hierarchy Level (Fair Value)
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	3,698	$	—	$	—	$	3,698
Long-term debt ⁽³⁾	265,571		—		291,837		—
Total	$	269,269	$	—	$	291,837	$	3,698


⁽¹⁾	The short-term portion is included in “Accounts payable, accrued expenses and other,” and the long-term portion is included in “Other liabilities” on the Consolidated Balance Sheets.


⁽²⁾	During the year ended December 31, 2019, we acquired a restructuring business that was assigned to the Corporate Finance segment.

⁽³⁾

The carrying values include unamortized deferred debt issue costs and debt discount.

Schedule of Acquisition-Related Contingent Consideration

The change in our liability for acquisition-related contingent consideration for our Level 3 financial instruments is as follows:



	Liability for Acquisition-Related Contingent Consideration
Balance at December 31, 2016	$	5,692
Additions ⁽¹⁾	3,426
Accretion for time value of money ⁽²⁾	1,589
Remeasurement gain ⁽³⁾	702
Payments	(5,161		)
Transfer out	(2,498		)
Balance at December 31, 2017	$	3,750
Accretion for time value of money ⁽²⁾	479
Payments	(531		)
Balance at December 31, 2018	$	3,698
Additions ⁽¹⁾	9,746
Accretion for time value of money ⁽²⁾	2,372
Payments	(1,000		)
Foreign currency translation adjustment ⁽⁴⁾	10
Balance at December 31, 2019	$	14,826


⁽¹⁾	We acquired restructuring businesses that were assigned to the Corporate Finance segment during the years ended December 31, 2017 and 2019.


⁽²⁾	Accretion for the time value of money is included in "Selling, general and administrative expenses" on the Consolidated Statements of Comprehensive Income.


⁽³⁾	Remeasurement gain or loss resulting from a change in the fair value of an acquisition's contingent consideration liability is recorded in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income.

⁽⁴⁾

Foreign currency translation adjustments are included in "Other comprehensive income (loss), net of tax" on the Consolidated Statements of Comprehensive Income.

Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Summary of Components of Debt Obligations

The table below summarizes the components of the Company’s debt:



	December 31,
	2019			2018
2023 Convertible Notes	$	316,250		$	316,250
Total debt	316,250			316,250
Less: deferred debt discount	(35,393		)	(43,998		)
Less: deferred debt issue costs	(5,248		)	(6,681		)
Long-term debt, net ⁽¹⁾	$	275,609		$	265,571
Additional paid-in capital	$	35,306		$	35,306
Discount attribution to equity	(1,175		)	(1,175		)
Equity component, net	$	34,131		$	34,131

⁽¹⁾

There were no current portions of long-term debt as of December 31, 2019 and 2018.

Summary of Interest Cost

The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes:



	December 31,
	2019		2018
Contractual interest expense	$	6,325	$	2,302
Amortization of debt discount ⁽¹⁾	8,606		3,018
Total	$	14,931	$	5,320

⁽¹⁾The effective interest rate of the liability component was 5.45%.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Lease assets and liabilities

The table below summarizes the carrying amount of our operating lease assets and liabilities:



		As of
Leases	Classification	December 31, 2019
Assets
Operating lease assets	Operating lease assets	$	159,777
Total lease assets		$	159,777
Liabilities
Current
Operating lease liabilities	Accounts payable, accrued expenses and other	$	35,727
Noncurrent
Operating lease liabilities	Noncurrent operating lease liabilities	176,378
Total lease liabilities		$	212,105

Lease cost

The table below summarizes total lease costs for the year ended December 31, 2019:



	Year Ended December 31,
Lease Cost	2019
Operating lease costs	$	45,144
Short-term lease costs	3,173
Variable lease costs	11,962
Sublease income	(5,015		)
Total lease cost	$	55,264

The table below summarizes cash paid for our operating lease liabilities and other non-cash information:



	Year Ended December 31,
	2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	46,079

Operating lease assets obtained in exchange for lease liabilities	$	37,774

Operating lease maturity analysis



	As of
	December 31, 2019
2020	$	45,849
2021	51,331
2022	32,194
2023	26,896
2024	23,654
Thereafter	77,162
Total future lease payments	257,086
Less: imputed interest	(44,981		)
Total	$	212,105

Weighted average remaining lease term (years)
Operating leases	6.5

Weighted average discount rate
Operating leases	5.6		%



	Operating Leases		Sublease Rental Income
	Operating Leases		Sublease Rental Income
2019	$	49,757	$	4,760
2020	47,084		3,944
2021	44,480		3,864
2022	24,471		707
2023	20,309		614
Thereafter	75,190		939
Total	$	261,291	$	14,828

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Summary of Components of Deferred Tax Assets and Liabilities

The table below summarizes significant components of deferred tax assets and liabilities.



	Year Ended December 31,
	2019			2018
Deferred tax assets
Allowance for doubtful accounts	$	13,041		$	11,792
Accrued vacation and bonus	27,438			23,545
Deferred rent	—			9,016
Share-based compensation	12,647			11,837
Notes receivable from employees	12,187			12,993
State net operating loss carryforward	2,066			3,510
Foreign net operating loss carryforward	9,388			9,857
Federal tax credit and capital loss carryforward	7,336			9,470
Deferred compensation	2,117			1,801
Operating lease assets	43,397			—
Employee benefits obligations	1,191			943
Other, net	1,898			186
Total deferred tax assets	132,706			94,950
Deferred tax liabilities
Revenue recognition	(6,732		)	(5,087		)
Operating lease liabilities	(29,671		)	—
Property and equipment, net	(3,797		)	(6,652		)
Equity debt discount	(8,890		)	(11,014		)
Goodwill and other intangible assets	(209,250		)	(199,964		)
Total deferred tax liabilities	(258,340		)	(222,717		)
Foreign withholding tax	(1,195		)	(413		)
Valuation allowance	(19,865		)	(21,929		)
Net deferred tax liabilities	$	(146,694	)	$	(150,109	)

Summary of Components of Income Before Income Tax Provision from Continuing Operations

The table below summarizes the components of income before income tax provision (benefit) from continuing operations.



	Year Ended December 31,
	2019		2018		2017
Domestic	$	150,860	$	96,543	$	30,013
Foreign	137,590		111,249		57,092
Total	$	288,450	$	207,792	$	87,105

Summary of Components of Income Tax Provision from Continuing Operations

The table below summarizes the components of income tax provision (benefit) from continuing operations.



	Year Ended December 31,
	2019			2018		2017
Current
Federal	$	30,651		$	10,847	$	15,164
State	7,702			4,447		742
Foreign	37,083			21,056		14,816
	75,436			36,350		30,722
Deferred
Federal	(1,767		)	14,538		(47,820		)
State	785			503		(152		)
Foreign	(2,730		)	5,790		(3,607		)
	(3,712		)	20,831		(51,579		)
Income tax provision (benefit)	$	71,724		$	57,181	$	(20,857	)

Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates

Our income tax provision (benefit) from continuing operations resulted in effective tax rates that varied from the statutory federal income tax rate as summarized below.



	Year Ended December 31,
	2019			2018			2017
Income tax expense at federal statutory rate	$	60,575		$	43,636		$	30,487
State income taxes, net of federal benefit	8,430			4,950			781
Detriment (benefit) from foreign tax rates	3,425			3,655			(8,500		)
Valuation allowance on foreign net operating loss carryforward	260			(450		)	253
Other expenses not deductible for tax purposes	4,362			3,543			2,466
Adjustment to reserve for uncertain tax positions	2,504			(132		)	456
Impact of 2017 U.S. tax reform — deferred tax	—			(706		)	(63,525		)
Impact of 2017 U.S. tax reform — Transition Tax	(1,088		)	50			18,655
Sale of Ringtail business	(2,097		)	3,798			—
Equity-based compensation	(4,447		)	(1,371		)	809
Other adjustments, net	(200		)	208			(2,739		)
Income tax provision (benefit)	$	71,724		$	57,181		$	(20,857	)

Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Stock Repurchases

The following table details our stock repurchases under the Repurchase Program:



	Year Ended December 31,
	2019		2018		2017
Shares of common stock repurchased and retired	1,258		756		4,674
Average price per share	$	84.16	$	53.88	$	35.94
Total cost	$	105,915	$	40,722	$	168,001

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments

The table below presents revenues and Adjusted Segment EBITDA for our reportable segments for the years ended December 31, 2019, 2018 and 2017.



	Year Ended December 31,
	2019		2018		2017
Revenues
Corporate Finance	$	723,721	$	564,479	$	482,041
FLC	577,780		520,333		462,324
Economic Consulting	592,542		533,979		496,029
Technology	215,584		185,755		174,850
Strategic Communications	243,090		223,331		192,488
Total revenues	$	2,352,717	$	2,027,877	$	1,807,732
Adjusted Segment EBITDA
Corporate Finance	$	160,735	$	121,660	$	82,863
FLC	104,435		96,821		72,705
Economic Consulting	84,112		69,955		61,964
Technology	45,688		27,387		22,171
Strategic Communications	44,544		42,918		27,732
Total Adjusted Segment EBITDA	$	439,514	$	358,741	$	267,435

Schedule of Reconciliation of Net Income to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization



	Year Ended December 31,
	2019			2018			2017
Net income	$	216,726		$	150,611		$	107,962
Add back:
Income tax provision (benefit)	71,724			57,181			(20,857		)
Interest income and other	(2,061		)	(4,977		)	(3,752		)
Interest expense	19,206			27,149			25,358
Gain on sale of business	—			(13,031		)	—
Loss on early extinguishment of debt	—			9,072			—
Unallocated corporate expenses	98,398			96,595			83,140
Segment depreciation expense	27,369			27,979			27,112
Amortization of intangible assets	8,152			8,162			10,563
Segment special charges	—			—			37,207
Remeasurement of acquisition-related contingent consideration	—			—			702
Total Adjusted Segment EBITDA	$	439,514		$	358,741		$	267,435

Schedule of Assets by Segments

The table below presents assets by segment. Segment assets primarily include accounts and notes receivable, fixed assets purchased specifically for the segment, goodwill and other intangible assets.



	December 31,
	2019		2018
Corporate Finance	$	814,820	$	707,924
FLC	462,155		412,667
Economic Consulting	543,475		516,123
Technology	200,430		171,002
Strategic Communications	217,129		212,147
Total segment assets	2,238,009		2,019,863
Unallocated corporate assets	545,133		359,258
Total assets	$	2,783,142	$	2,379,121

Schedule of Revenues Based on Location of Legal Entity and Information on Long-Lived Assets and Net Assets



	Year Ended December 31,
	2019		2018		2017
U.S.	$	1,555,133	$	1,372,116	$	1,262,682
United Kingdom	389,338		302,576		251,843
All other foreign countries	408,246		353,185		293,207
Total revenues	$	2,352,717	$	2,027,877	$	1,807,732

We do not have a single customer that represents 10% or more of our consolidated revenues.



	December 31, 2019						December 31, 2018
	U.S.		United Kingdom		All Other Foreign Countries		U.S.		United Kingdom		All Other Foreign Countries
Property and equipment, net	$	63,563	$	16,423	$	13,686	$	59,611	$	14,023	$	10,943
Net assets	$	925,288	$	196,087	$	367,767	$	867,321	$	160,894	$	320,610

Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data



	Quarter Ended
	March 31			June 30			September 30			December 31
2019
Revenues	$	551,274		$	606,119		$	593,106		$	602,218
Operating expenses
Direct cost of revenues	349,066			386,266			380,892			418,672
Selling, general and administrative expenses	113,185			129,906			127,951			133,032
Amortization of other intangible assets	1,861			1,852			2,125			2,314
	464,112			518,024			510,968			554,018
Operating income	87,162			88,095			82,138			48,200
Interest income and other	159			2,609			2,973			(3,680		)
Interest expense	(4,746		)	(4,793		)	(4,832		)	(4,835		)
Income before income tax provision	82,575			85,911			80,279			39,685
Income tax provision	19,930			21,313			19,857			10,624
Net income	$	62,645		$	64,598		$	60,422		$	29,061
Earnings per common share — basic ⁽¹⁾	$	1.69		$	1.75		$	1.65		$	0.80
Earnings per common share — diluted ⁽¹⁾	$	1.64		$	1.69		$	1.59		$	0.76
Weighted average common shares outstanding
Basic	36,981			36,960			36,617			36,545
Diluted	38,219			38,168			37,938			38,126



	Quarter Ended
	March 31			June 30			September 30			December 31
2018
Revenues	$	497,774		$	512,098		$	513,012		$	504,993
Operating expenses
Direct cost of revenues	321,117			330,318			336,477			340,162
Selling, general and administrative expenses	112,128			117,897			117,448			118,163
Amortization of other intangible assets	2,270			2,052			1,975			1,865
	435,515			450,267			455,900			460,190
Operating income	62,259			61,831			57,112			44,803
Interest income and other	(1,800		)	2,474			1,400			2,903
Interest expense	(6,244		)	(6,583		)	(7,246		)	(7,076		)
Gain on sale of business	—			—			13,031			—
Loss on early extinguishment of debt	—			—			—			(9,072		)
Income before income tax provision	54,215			57,722			64,297			31,558
Income tax provision	15,270			14,113			19,964			7,834
Net income	$	38,945		$	43,609		$	44,333		$	23,724
Earnings per common share — basic ⁽¹⁾	$	1.06		$	1.18		$	1.19		$	0.63
Earnings per common share — diluted ⁽¹⁾	$	1.04		$	1.14		$	1.14		$	0.61
Weighted average common shares outstanding
Basic	36,700			37,001			37,318			37,368
Diluted	37,612			38,271			38,756			38,628

⁽¹⁾

The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.

Description of Business and Summary of Significant Accounting Policies (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 20, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of reportable business segments \| segment	5
Advertising costs	$ 18,600,000	$ 15,500,000	$ 14,800,000
Provision for doubtful accounts	$ 19,602,000	$ 17,872,000	$ 15,386,000
Forgivable loans, forgiveness period, minimum	1 year
Forgivable loans, forgiveness period, maximum	10 years
Definite-lived intangible assets amortization period	13 years 4 months 24 days
Renewal term	7 years
Minimum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Definite-lived intangible assets amortization period	3 years
Renewal term	6 months
Maximum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Definite-lived intangible assets amortization period	15 years
Renewal term	7 years
Furniture, Equipment, And Internal-Use Software \| Minimum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful of furniture, equipment and internal use software (in years)	3 years
Furniture, Equipment, And Internal-Use Software \| Maximum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful of furniture, equipment and internal use software (in years)	7 years
Software and Software Development Costs
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Estimated useful of furniture, equipment and internal use software (in years)	3 years
Geographic Concentration Risk \| Consolidated Revenues \| Non U.S
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Revenue from the work of professionals	34.00%
Senior Notes \| Convertible Note Due 2023
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Interest rate (as a percent)				2.00%
Principal amount				$ 316,300,000

New Accounting Standards (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 159,777
Operating lease liability	$ 212,105
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets		$ 148,500
Operating lease liability		$ 206,700
Deferred rent and cease-use liability			$ 62,300
Prepaid rent			$ 4,100

Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Common Share [Line Items]
Conversion price (in dollars per share)	$ 101.38								$ 101.38
Numerator — basic and diluted
Net income	$ 29,061	$ 60,422	$ 64,598	$ 62,645	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 216,726	$ 150,611	$ 107,962
Denominator
Weighted average number of common shares outstanding — basic (in shares)	36,545	36,617	36,960	36,981	37,368	37,318	37,001	36,700	36,774	37,098	38,697
Effect of dilutive convertible notes (in shares)									62	0	0
Effect of dilutive stock options (in shares)									455	491	117
Effect of dilutive restricted shares (in shares)									820	729	378
Weighted average number of common shares outstanding — diluted (in shares)	38,126	37,938	38,168	38,219	38,628	38,756	38,271	37,612	38,111	38,318	39,192
Earnings per common share — basic (in dollars per share)	$ 0.80	$ 1.65	$ 1.75	$ 1.69	$ 0.63	$ 1.19	$ 1.18	$ 1.06	$ 5.89	$ 4.06	$ 2.79
Earnings per common share — diluted (in dollars per share)	$ 0.76	$ 1.59	$ 1.69	$ 1.64	$ 0.61	$ 1.14	$ 1.14	$ 1.04	$ 5.69	$ 3.93	$ 2.75
Stock Options And Restricted Shares
Denominator
Antidilutive stock options and restricted shares (in shares)									19	175	1,561

Revenues (Details) - USD ($) $ in Millions	12 Months Ended
Revenues (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues recognized related to catch-up adjustment	$ 28.9	$ 16.1
Amount of remaining performance obligation		8.8
Contract asset balance	1.3	$ 2.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Amount of remaining performance obligation	$ 2.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining period of performance obligation	24 months

Special Charges - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 0	$ 40,885,000
Employee Severance
Restructuring Cost and Reserve [Line Items]
Special charges			23,500,000
Contract Termination
Restructuring Cost and Reserve [Line Items]
Special charges			14,400,000
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Special charges			$ 3,000,000.0

Share-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0
Cash received from option exercises	$ 9,700,000	$ 41,600,000	$ 4,100,000
Tax benefit realized from stock options exercised	700,000	4,000,000.0	1,100,000
Intrinsic value of options exercised	13,200,000	26,400,000	900,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 100,000
Unrecognized compensation cost, recognition period (in years)	2 months 12 days
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 27,500,000
Unrecognized compensation cost, recognition period (in years)	4 years
Fair value, released	$ 18,600,000	10,400,000	9,900,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 800,000
Unrecognized compensation cost, recognition period (in years)	2 years 9 months 18 days
Fair value, released	$ 4,500,000	5,400,000	4,100,000
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 6,300,000
Unrecognized compensation cost, recognition period (in years)	1 year 1 month 6 days
Fair value, released	$ 5,800,000	$ 1,400,000	$ 0
Omnibus Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)	1,396,183
Minimum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	2 years
Maximum \| Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years

Share-Based Compensation - Schedule of Share-based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 3,125	$ 2,807	$ 1,577
Stock options \| Direct cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	497	780	370
Stock options \| Selling, general and administrative expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	2,628	2,027	1,207
Stock options \| Special charges
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	0	0	0
Restricted Shares
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	20,874	17,995	14,830
Restricted Shares \| Direct cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	11,869	9,804	9,691
Restricted Shares \| Selling, general and administrative expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	9,005	8,191	4,870
Restricted Shares \| Special charges
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 0	$ 0	$ 269

Share-Based Compensation - Schedule of Stock Option and Grants Using Valuation Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term	3 years
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as a percent)	1.60%
Dividend yield (as a percent)	0.00%
Stock price volatility (as a percent)	31.94%

Share-Based Compensation - Schedule of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Options
Stock options outstanding beginning of period (in shares)	935,000
Stock options granted (in shares)	0
Stock options exercised (in shares)	(256,000)
Stock options forfeited (in shares)	(1,000)
Stock options outstanding end of period (in shares)	678,000
Stock options exercisable at end of period (in shares)	605,000
Weighted Average Exercise Price
Stock options outstanding, Weighted Average Exercise Price, beginning of period (in dollars per share) \| $ / shares	$ 36.50
Stock options exercised, Weighted Average Exercise Price (in dollars per share) \| $ / shares	37.88
Stock options forfeited, Weighted Average Exercise Price (in dollars per share) \| $ / shares	30.28
Stock options outstanding, Weighted Average Exercise Price, end of period (in dollars per share) \| $ / shares	35.98
Stock options exercisable, end of period, Weighted Average Exercise Price (in dollars per share) \| $ / shares	$ 35.75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 8 months 12 days
Stock options exercisable, Weighted Average Remaining Contractual Term (in Years)	4 years 7 months 6 days
Stock options outstanding, Aggregate Intrinsic Value \| $	$ 50,669
Stock options exercisable, Aggregate Intrinsic Value \| $	$ 45,343

Share-Based Compensation - Schedule of Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding (in shares) \| shares	678,000
Options Exercisable, Shares \| shares	605,000
$26.68-$33.95
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	$ 26.68
Exercise Price Range, maximum (in dollars per share)	$ 33.95
Options Outstanding (in shares) \| shares	137,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.46
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	3 years 8 months 12 days
Options Exercisable, Shares \| shares	124,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.53
$34.33-$34.62
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	34.33
Exercise Price Range, maximum (in dollars per share)	$ 34.62
Options Outstanding (in shares) \| shares	138,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 34.40
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 4 months 24 days
Options Exercisable, Shares \| shares	138,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 34.40
$35.73-$36.87
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	35.73
Exercise Price Range, maximum (in dollars per share)	$ 36.87
Options Outstanding (in shares) \| shares	195,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 36.67
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 4 months 24 days
Options Exercisable, Shares \| shares	188,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 36.68
$36.89-$40.36
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	36.89
Exercise Price Range, maximum (in dollars per share)	$ 40.36
Options Outstanding (in shares) \| shares	202,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 39.28
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 4 months 24 days
Options Exercisable, Shares \| shares	149,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 39.12
$41.69-$41.69
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	41.69
Exercise Price Range, maximum (in dollars per share)	$ 41.69
Options Outstanding (in shares) \| shares	6,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 41.69
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	3 months 18 days
Options Exercisable, Shares \| shares	6,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 41.69

Share-Based Compensation - Schedule of Unvested Restricted Share Activity (Detail) - Restricted Shares shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares) \| shares	992
Awards granted (in shares) \| shares	222
Awards vested (in shares) \| shares	(229)
Awards forfeited (in shares) \| shares	(28)
Unvested share awards outstanding, end of period (in shares) \| shares	957
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 43.76
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	81.64
Restricted share awards vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	43.04
Awards forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	38.87
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 52.86

Share-Based Compensation - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares)	335
Awards granted (in shares)	30
Awards released (in shares)	(52)
Awards forfeited (in shares)	0
Unvested share awards outstanding, end of period (in shares)	313
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 39.72
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	82.39
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	42.15
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 43.45

Share-Based Compensation - Schedule of Performance Stock Units Activity (Detail) - Performance Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares)	275
Awards granted (in shares)	170
Awards released (in shares)	(84)
Awards forfeited (in shares)	0
Unvested share awards outstanding, end of period (in shares)	361
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 42.60
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	77.67
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	35.75
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 60.67
Maximum payout potential	150.00%
Minimum
Weighted Average Grant Date Fair Value
Maximum payout potential	0.00%
Maximum
Weighted Average Grant Date Fair Value
Maximum payout potential	150.00%

Share-Based Compensation - Schedule of Weighted-Average Grant Date Fair Value Per Share of Stock Options, Restricted Share Awards, Restricted Stock Units and Performance Stock Units Awarded (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of grants. Stock options (in dollars per share)	$ 0	$ 0	$ 9.56
Restricted share awards, restricted stock units and performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 80.10	$ 51.73	$ 38.88

Interest Income and Other (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Interest Income and Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Interest income									$ 4,761	$ 5,448	$ 3,968
Foreign exchange transaction gains (losses), net									(3,056)	261	(77)
Other									356	(732)	(139)
Total	$ (3,680)	$ 2,973	$ 2,609	$ 159	$ 2,903	$ 1,400	$ 2,474	$ (1,800)	$ 2,061	$ 4,977	$ 3,752

Balance Sheet Details (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Prepaid expenses and other current assets
Prepaid expenses	$ 39,740	$ 35,762
Income tax receivable	8,161	18,947
Other current assets	32,909	14,739
Total	80,810	69,448
Accounts payable, accrued expenses and other
Accounts payable	18,346	17,728
Accrued expenses	46,511	52,461
Accrued interest payable	2,243	2,358
Accrued taxes payable	35,895	13,119
Current operating lease liabilities	35,727	0
Other current liabilities	20,214	18,934
Total	$ 158,936	$ 104,600

Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 260,798	$ 232,560
Accumulated depreciation	(167,126)	(147,983)
Property and equipment, net	93,672	84,577
Depreciation expense for property and equipment	30,100	26,200	$ 24,400
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	99,837	88,623
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,359	2,754
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,698	34,865
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 119,904	$ 106,318

Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill		$ 1,366,455	$ 1,398,942
Accumulated goodwill impairment		(194,139)	(194,139)
Goodwill beginning of period		1,172,316	1,204,803
Sale of business			(20,928)
Acquisitions		27,389
Foreign currency translation adjustment and other		3,062	(11,559)
Goodwill	$ 1,396,906	1,396,906	1,366,455	$ 1,398,942
Accumulated goodwill impairment	(194,139)	(194,139)	(194,139)	(194,139)
Goodwill end of period	1,202,767	1,202,767	1,172,316	1,204,803
Proceeds from sale of business		0	50,283	0
Corporate Finance
Goodwill [Roll Forward]
Goodwill		450,997	454,816
Accumulated goodwill impairment		0	0
Goodwill beginning of period		450,997	454,816
Sale of business			0
Acquisitions		27,389
Foreign currency translation adjustment and other		456	(3,819)
Goodwill	478,842	478,842	450,997	454,816
Accumulated goodwill impairment	0	0	0	0
Goodwill end of period	478,842	478,842	450,997	454,816
Forensic and Litigation Consulting
Goodwill [Roll Forward]
Goodwill		231,537	233,719
Accumulated goodwill impairment		0	0
Goodwill beginning of period		231,537	233,719
Sale of business			0
Acquisitions		0
Foreign currency translation adjustment and other		583	(2,182)
Goodwill	232,120	232,120	231,537	233,719
Accumulated goodwill impairment	0	0	0	0
Goodwill end of period	232,120	232,120	231,537	233,719
Economic Consulting
Goodwill [Roll Forward]
Goodwill		268,547	268,995
Accumulated goodwill impairment		0	0
Goodwill beginning of period		268,547	268,995
Sale of business			0
Acquisitions		0
Foreign currency translation adjustment and other		130	(448)
Goodwill	268,677	268,677	268,547	268,995
Accumulated goodwill impairment	0	0	0	0
Goodwill end of period	268,677	268,677	268,547	268,995
Technology
Goodwill [Roll Forward]
Goodwill		96,723	117,740
Accumulated goodwill impairment		0	0
Goodwill beginning of period		96,723	117,740
Sale of business			(20,928)
Acquisitions		0
Foreign currency translation adjustment and other		47	(89)
Goodwill	96,770	96,770	96,723	117,740
Accumulated goodwill impairment	0	0	0	0
Goodwill end of period	96,770	96,770	96,723	117,740
Proceeds from sale of business			50,300
Strategic Communications
Goodwill [Roll Forward]
Goodwill		318,651	323,672
Accumulated goodwill impairment		(194,139)	(194,139)
Goodwill beginning of period		124,512	129,533
Sale of business			0
Acquisitions		0
Foreign currency translation adjustment and other		1,846	(5,021)
Goodwill	320,497	320,497	318,651	323,672
Accumulated goodwill impairment	(194,139)	(194,139)	(194,139)	(194,139)
Goodwill end of period	126,358	$ 126,358	$ 124,512	$ 129,533
Andersch AG
Goodwill [Roll Forward]
Acquisitions	$ 27,400

Goodwill and Other Intangible Assets - Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	13 years 4 months 24 days
Amortized intangible assets, Gross Carrying Amount	$ 112,854	$ 102,187
Amortized intangible assets, Accumulated Amortization	79,522	72,654
Amortized intangible assets, Net Carrying Amount	33,332	29,533
Unamortized intangible assets, Gross Carrying Amount	117,954	107,287
Intangible assets, Net Carrying Amount	38,432	34,633
Trademarks
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Amount	$ 5,100	5,100
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	14 years 2 months 12 days
Amortized intangible assets, Gross Carrying Amount	$ 99,613	99,080
Amortized intangible assets, Accumulated Amortization	76,808	71,036
Amortized intangible assets, Net Carrying Amount	$ 22,805	28,044
Trademarks
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	6 years
Amortized intangible assets, Gross Carrying Amount	$ 9,855	0
Amortized intangible assets, Accumulated Amortization	653	0
Amortized intangible assets, Net Carrying Amount	$ 9,202	0
Acquired software and other
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	9 years 1 month 6 days
Amortized intangible assets, Gross Carrying Amount	$ 3,386	3,107
Amortized intangible assets, Accumulated Amortization	2,061	1,618
Amortized intangible assets, Net Carrying Amount	$ 1,325	$ 1,489

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of other intangible assets	$ 2,314	$ 2,125	$ 1,852	$ 1,861	$ 1,865	$ 1,975	$ 2,052	$ 2,270	$ 8,152	$ 8,162	$ 10,563

Goodwill and Other Intangible Assets - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 9,393
2021	8,861
2022	7,028
2023	3,604
2024	2,207
Thereafter	2,239
Amortized intangible assets, Net Carrying Amount	$ 33,332	$ 29,533

Notes Receivable from Employees - Summary of Changes in Carrying Amount of Notes Receivable From Employees (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable, Related Parties [Roll Forward]
Notes receivable from employees — beginning	$ 113,699	$ 123,796
Notes granted	28,879	32,937
Repayments	(13,179)	(5,405)
Amortization	(26,294)	(36,418)
Cumulative translation adjustment and other	1,034	(1,211)
Notes receivable from employees — ending	$ 113,699	$ 123,796	$ 104,139	$ 113,699
Less: current portion			(35,106)	(29,228)
Notes receivable from employees, net of current portion			$ 69,033	$ 84,471

Notes Receivable from Employees - Additional information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) note	Dec. 31, 2018 USD ($) note	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Notes outstanding (in notes) \| note	303	294
Amortization of forgivable loan expense \| $	$ 26.3	$ 36.4	$ 26.8

Financial Instruments - Carrying And Estimated Fair Value Of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	$ 14,826	$ 3,698
Long-term debt	275,609	265,571
Total	290,435	269,269
Level 1 \| Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	0	0
Long-term debt	0	0
Total	0	0
Level 2 \| Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	0	0
Long-term debt	398,016	291,837
Total	398,016	291,837
Level 3 \| Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	14,826	3,698
Long-term debt	0	0
Total	$ 14,826	$ 3,698

Financial Instruments - Additional Information (Detail)	Dec. 31, 2019 USD ($)
Measurement Input, Discount Rate \| Probability Weighted
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.135
Measurement Input, Discount Rate \| Monte Carlo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.136
Measurement Input, Price Volatility \| Monte Carlo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Measurement input	0.300

Financial Instruments - Fair Value Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 3,698	$ 3,750	$ 5,692
Additions	9,746		3,426
Accretion for time value of money	2,372	479	1,589
Remeasurement gain			702
Payments	(1,000)	(531)	(5,161)
Transfer out			(2,498)
Foreign currency translation adjustment	10
Ending balance	$ 14,826	$ 3,698	$ 3,750

Debt - Summary of Components of Long-Term Debt Obligations (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 316,250,000	$ 316,250,000
Less: deferred debt discount	(35,393,000)	(43,998,000)
Less: deferred debt issue costs	(5,248,000)	(6,681,000)
Long-term debt, net	275,609,000	265,571,000
Additional paid-in capital	35,306,000	35,306,000
Discount attribution to equity	(1,175,000)	(1,175,000)
Equity component, net	34,131,000	34,131,000
Long-term debt, current portion	0		$ 0
Convertible Note Due 2023
Debt Instrument [Line Items]
Total debt	316,250,000	316,250,000
Line of Credit \| Credit facility
Debt Instrument [Line Items]
Less: deferred debt issue costs	(2,000,000.0)	$ (3,600,000)
Long-term Line of Credit	$ 0

Debt - Additional Information (Detail)		1 Months Ended	3 Months Ended				12 Months Ended
Debt - Additional Information (Detail)	Aug. 20, 2018 USD ($) $ / shares	Nov. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 15, 2018 USD ($)
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares							$ 101.38
Loss on early extinguishment of debt			$ (9,072,000)	$ 0	$ 0	$ 0	$ 0	$ (9,072,000)	$ 0
Unamortized debt issue costs			6,681,000				5,248,000	6,681,000
Senior Notes \| Convertible Note Due 2023
Debt Instrument [Line Items]
Principal amount	$ 316,300,000
Interest rate (as a percent)	2.00%
Conversion rate	9.8643
Conversion price (in dollars per share) \| $ / shares	$ 101.38
Senior Notes \| 6% senior notes due 2022
Debt Instrument [Line Items]
Principal amount										$ 300,000,000.0
Interest rate (as a percent)										6.00%
Redemption premium								6,000,000.0
Write off of deferred debt issuance cost								3,100,000
Line of Credit
Debt Instrument [Line Items]
Borrowing limit used							1,000,000.0
Line of Credit \| Credit facility
Debt Instrument [Line Items]
Senior secured revolving line of credit							$ 550,000,000.0
Line of credit, maturity date							Jun. 26, 2020
Debt issuance costs		$ 1,700,000
Borrowings outstanding							$ 0
Unamortized debt issue costs			$ 3,600,000				$ 2,000,000.0	$ 3,600,000
Line of Credit \| Credit facility \| Minimum
Debt Instrument [Line Items]
Commitment fee (as a percent)							0.20%
Fronting fees (as a percent)							1.25%
Line of Credit \| Credit facility \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread (as a percent)		1.25%
Line of Credit \| Credit facility \| Minimum \| Base Rate
Debt Instrument [Line Items]
Basis spread (as a percent)		0.25%
Line of Credit \| Credit facility \| Maximum
Debt Instrument [Line Items]
Commitment fee (as a percent)							0.35%
Fronting fees (as a percent)							2.00%
Line of Credit \| Credit facility \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread (as a percent)		2.00%
Line of Credit \| Credit facility \| Maximum \| Base Rate
Debt Instrument [Line Items]
Basis spread (as a percent)		1.00%
Debt Instrument, Redemption, Period One \| Senior Notes \| Convertible Note Due 2023
Debt Instrument [Line Items]
Redemption price percentage							130.00%
Debt Instrument, Redemption, Period Two \| Senior Notes \| Convertible Note Due 2023
Debt Instrument [Line Items]
Redemption price percentage							98.00%

Debt - Interest Cost Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs	$ 11,615	$ 5,456	$ 1,984
Senior Notes \| Convertible Note Due 2023
Debt Instrument [Line Items]
Contractual interest expense	6,325	2,302
Amortization of debt discount and issuance costs	8,606	3,018
Interest expense	$ 14,931	$ 5,320
Effective interest rate	5.45%

Leases - Additional Information (Details) $ in Millions	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Renewal term	7 years
2020	$ 4.9
2021	4.5
2022	0.7
2023	0.6
2024	0.6
Thereafter	$ 0.3
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	6 months
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	7 years

Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease assets	$ 159,777
Current operating lease liabilities	35,727	$ 0
Noncurrent operating lease liabilities	176,378
Total lease liabilities	$ 212,105

Leases - Lease Cost (Details) $ in Thousands	12 Months Ended
Leases - Lease Cost (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease costs	$ 45,144
Short-term lease costs	3,173
Variable lease costs	11,962
Sublease income	(5,015)
Total lease cost	$ 55,264

Leases - Maturity Analysis (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
2020	$ 45,849
2021	51,331
2022	32,194
2023	26,896
2024	23,654
Thereafter	77,162
Total future lease payments	257,086
Less: imputed interest	(44,981)
Total lease liabilities	$ 212,105
Weighted average remaining lease term (years)
Weighted average remaining lease term (years)	6 years 6 months
Weighted average discount rate
Weighted average discount rate	5.60%

Leases - Cash Paid For Operating Leases and Noncash Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 46,079
Operating lease assets obtained in exchange for lease liabilities	$ 37,774

Leases - Operating Lease Commitments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Operating Leases
2019	$ 49,757
2020	47,084
2021	44,480
2022	24,471
2023	20,309
Thereafter	75,190
Total	261,291
Sublease Rental Income
2019	4,760
2020	3,944
2021	3,864
2022	707
2023	614
Thereafter	939
Total	$ 14,828

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowance	$ 19,865				$ 21,929				$ 19,865	$ 21,929
Deferred tax liability not recognized related to tax basis difference in investment in foreign subsidiaries	22,900								22,900
Income tax provision	10,624	$ 19,857	$ 21,313	$ 19,930	7,834	$ 19,964	$ 14,113	$ 15,270	71,724	57,181	$ (20,857)
Liability for uncertain tax positions	$ 11,100				$ 3,700				$ 11,100	$ 3,700

Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets, Gross [Abstract]
Allowance for doubtful accounts	$ 13,041	$ 11,792
Accrued vacation and bonus	27,438	23,545
Deferred rent	0	9,016
Share-based compensation	12,647	11,837
Notes receivable from employees	12,187	12,993
State net operating loss carryforward	2,066	3,510
Foreign net operating loss carryforward	9,388	9,857
Federal tax credit and capital loss carryforward	7,336	9,470
Deferred compensation	2,117	1,801
Operating lease assets	43,397
Employee benefits obligations	1,191	943
Other, net	1,898	186
Total deferred tax assets	132,706	94,950
Deferred tax liabilities
Revenue recognition	(6,732)	(5,087)
Operating lease liabilities	(29,671)
Property and equipment, net	(3,797)	(6,652)
Equity debt discount	(8,890)	(11,014)
Goodwill and other intangible assets	(209,250)	(199,964)
Total deferred tax liabilities	(258,340)	(222,717)
Foreign withholding tax	(1,195)	(413)
Valuation allowance	(19,865)	(21,929)
Net deferred tax liabilities	$ (146,694)	$ (150,109)

Income Taxes - Summary of Components of Income Before Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic									$ 150,860	$ 96,543	$ 30,013
Foreign									137,590	111,249	57,092
Income before income tax provision	$ 39,685	$ 80,279	$ 85,911	$ 82,575	$ 31,558	$ 64,297	$ 57,722	$ 54,215	$ 288,450	$ 207,792	$ 87,105

Income Taxes - Summary of Components of Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal									$ 30,651	$ 10,847	$ 15,164
State									7,702	4,447	742
Foreign									37,083	21,056	14,816
Current, Total									75,436	36,350	30,722
Deferred
Federal									(1,767)	14,538	(47,820)
State									785	503	(152)
Foreign									(2,730)	5,790	(3,607)
Deferred, Total									(3,712)	20,831	(51,579)
Income tax provision (benefit)	$ 10,624	$ 19,857	$ 21,313	$ 19,930	$ 7,834	$ 19,964	$ 14,113	$ 15,270	$ 71,724	$ 57,181	$ (20,857)

Income Taxes - Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate									$ 60,575	$ 43,636	$ 30,487
State income taxes, net of federal benefit									8,430	4,950	781
Detriment (benefit) from foreign tax rates									3,425	3,655	(8,500)
Valuation allowance on foreign net operating loss carryforward									260	(450)	253
Other expenses not deductible for tax purposes									4,362	3,543	2,466
Adjustment to reserve for uncertain tax positions									2,504	(132)	456
Impact of 2017 U.S. tax reform — deferred tax									0	(706)	(63,525)
Impact of 2017 U.S. tax reform — Transition Tax									(1,088)	50	18,655
Sale of Ringtail business									(2,097)	3,798	0
Equity-based compensation									(4,447)	(1,371)	809
Other adjustments, net									(200)	208	(2,739)
Income tax provision (benefit)	$ 10,624	$ 19,857	$ 21,313	$ 19,930	$ 7,834	$ 19,964	$ 14,113	$ 15,270	$ 71,724	$ 57,181	$ (20,857)

Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Aug. 16, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Feb. 21, 2019	Aug. 13, 2018	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016
Stockholders Equity [Line Items]
Total cost		$ 105,941,000	$ 55,738,000	$ 168,094,000
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount					$ 400,000,000.0				$ 100,000,000.0
Stock repurchase program additional amount authorized					$ 100,000,000.0		$ 100,000,000.0	$ 100,000,000.0
Available amount under repurchase program		$ 66,600,000
Shares of common stock repurchased and retired (in shares)		1,258,000	756,000	4,674,000
Average price per share (in dollars per share)		$ 84.16	$ 53.88	$ 35.94
Total cost		$ 105,915,000	$ 40,722,000	$ 168,001,000
2018 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount						$ 25,000,000.0
Shares of common stock repurchased and retired (in shares)	196,050
Average price per share (in dollars per share)	$ 76.51
Total cost	$ 15,000,000.0

Stockholders' Equity - Schedule of Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Total cost	$ 105,941	$ 55,738	$ 168,094
2016 Stock Repurchase Program
Class of Stock [Line Items]
Shares of common stock repurchased and retired (in shares)	1,258	756	4,674
Average price per share (in dollars per share)	$ 84.16	$ 53.88	$ 35.94
Total cost	$ 105,915	$ 40,722	$ 168,001

Employee Benefit Plans (Detail) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plans (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S.
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to plan	$ 17.4	$ 15.2	$ 11.6
United Kingdom
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to plan	$ 7.3	$ 7.7	$ 6.4

Segment Reporting - Additional Information (Detail)	12 Months Ended
Segment Reporting - Additional Information (Detail)	Dec. 31, 2019 segment
Segment Reporting [Abstract]
Number of reportable business segments (in segments)	5

Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 2,352,717	$ 2,027,877	$ 1,807,732
Adjusted Segment EBITDA									439,514	358,741	267,435
Corporate Finance
Segment Reporting Information [Line Items]
Revenues									723,721	564,479	482,041
Adjusted Segment EBITDA									160,735	121,660	82,863
FLC
Segment Reporting Information [Line Items]
Revenues									577,780	520,333	462,324
Adjusted Segment EBITDA									104,435	96,821	72,705
Economic Consulting
Segment Reporting Information [Line Items]
Revenues									592,542	533,979	496,029
Adjusted Segment EBITDA									84,112	69,955	61,964
Technology
Segment Reporting Information [Line Items]
Revenues									215,584	185,755	174,850
Adjusted Segment EBITDA									45,688	27,387	22,171
Strategic Communications
Segment Reporting Information [Line Items]
Revenues									243,090	223,331	192,488
Adjusted Segment EBITDA									$ 44,544	$ 42,918	$ 27,732

Segment Reporting - Reconciliation of Net Income To Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Net income	$ 29,061	$ 60,422	$ 64,598	$ 62,645	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 216,726	$ 150,611	$ 107,962
Income tax provision (benefit)	10,624	19,857	21,313	19,930	7,834	19,964	14,113	15,270	71,724	57,181	(20,857)
Interest income and other	3,680	(2,973)	(2,609)	(159)	(2,903)	(1,400)	(2,474)	1,800	(2,061)	(4,977)	(3,752)
Interest expense	$ 4,835	$ 4,832	$ 4,793	$ 4,746	7,076	7,246	6,583	6,244	19,206	27,149	25,358
Gain on sale of business					0	(13,031)	0	0	0	(13,031)	0
Loss on early extinguishment of debt					$ 9,072	$ 0	$ 0	$ 0	0	9,072	0
Unallocated corporate expenses									98,398	96,595	83,140
Segment depreciation expense									27,369	27,979	27,112
Amortization of intangible assets									8,152	8,162	10,563
Segment special charges									0	0	37,207
Remeasurement of acquisition-related contingent consideration									0	0	702
Adjusted Segment EBITDA									$ 439,514	$ 358,741	$ 267,435

Segment Reporting - Schedule of Assets by Segments (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total assets	$ 2,783,142	$ 2,379,121
Operating Segments
Segment Reporting Information [Line Items]
Total assets	2,238,009	2,019,863
Operating Segments \| Corporate Finance & Restructuring
Segment Reporting Information [Line Items]
Total assets	814,820	707,924
Operating Segments \| Forensic and Litigation Consulting
Segment Reporting Information [Line Items]
Total assets	462,155	412,667
Operating Segments \| Economic Consulting
Segment Reporting Information [Line Items]
Total assets	543,475	516,123
Operating Segments \| Technology
Segment Reporting Information [Line Items]
Total assets	200,430	171,002
Operating Segments \| Strategic Communications
Segment Reporting Information [Line Items]
Total assets	217,129	212,147
Unallocated corporate assets
Segment Reporting Information [Line Items]
Total assets	$ 545,133	$ 359,258

Segment Reporting - Revenues Based on Location of Legal Entity (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 2,352,717	$ 2,027,877	$ 1,807,732
U.S.
Segment Reporting Information [Line Items]
Revenues									1,555,133	1,372,116	1,262,682
United Kingdom
Segment Reporting Information [Line Items]
Revenues									389,338	302,576	251,843
All other foreign countries
Segment Reporting Information [Line Items]
Revenues									$ 408,246	$ 353,185	$ 293,207

Segment Reporting - Information on Long-Lived Assets and Net Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property and equipment, net	$ 93,672	$ 84,577
U.S.
Segment Reporting Information [Line Items]
Property and equipment, net	63,563	59,611
Net assets	925,288	867,321
United Kingdom
Segment Reporting Information [Line Items]
Property and equipment, net	16,423	14,023
Net assets	196,087	160,894
All other foreign countries
Segment Reporting Information [Line Items]
Property and equipment, net	13,686	10,943
Net assets	$ 367,767	$ 320,610

Quarterly Financial Data (unaudited) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 2,352,717	$ 2,027,877	$ 1,807,732
Operating expenses
Direct cost of revenues	418,672	380,892	386,266	349,066	340,162	336,477	330,318	321,117	1,534,896	1,328,074	1,215,560
Selling, general and administrative expenses	133,032	127,951	129,906	113,185	118,163	117,448	117,897	112,128	504,074	465,636	432,013
Amortization of other intangible assets	2,314	2,125	1,852	1,861	1,865	1,975	2,052	2,270	8,152	8,162	10,563
Costs and Expenses	554,018	510,968	518,024	464,112	460,190	455,900	450,267	435,515	2,047,122	1,801,872	1,699,021
Operating income	48,200	82,138	88,095	87,162	44,803	57,112	61,831	62,259	305,595	226,005	108,711
Interest income and other	(3,680)	2,973	2,609	159	2,903	1,400	2,474	(1,800)	2,061	4,977	3,752
Interest expense	(4,835)	(4,832)	(4,793)	(4,746)	(7,076)	(7,246)	(6,583)	(6,244)	(19,206)	(27,149)	(25,358)
Gain on sale of business					0	13,031	0	0	0	13,031	0
Loss on early extinguishment of debt					(9,072)	0	0	0	0	(9,072)	0
Income before income tax provision	39,685	80,279	85,911	82,575	31,558	64,297	57,722	54,215	288,450	207,792	87,105
Income tax provision	10,624	19,857	21,313	19,930	7,834	19,964	14,113	15,270	71,724	57,181	(20,857)
Net income	$ 29,061	$ 60,422	$ 64,598	$ 62,645	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 216,726	$ 150,611	$ 107,962
Earnings per common share — basic (in dollars per share)	$ 0.80	$ 1.65	$ 1.75	$ 1.69	$ 0.63	$ 1.19	$ 1.18	$ 1.06	$ 5.89	$ 4.06	$ 2.79
Earnings per common share — diluted (in dollars per share)	$ 0.76	$ 1.59	$ 1.69	$ 1.64	$ 0.61	$ 1.14	$ 1.14	$ 1.04	$ 5.69	$ 3.93	$ 2.75
Weighted average common shares outstanding
Basic (in shares)	36,545	36,617	36,960	36,981	37,368	37,318	37,001	36,700	36,774	37,098	38,697
Diluted (in shares)	38,126	37,938	38,168	38,219	38,628	38,756	38,271	37,612	38,111	38,318	39,192

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts and unbilled services
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 202,394	$ 180,687	$ 178,819
Charged to Expense	19,602	17,872	15,386
Charged to Other Accounts	56,238	25,300	9,656
Deductions	12,734	21,465	23,174
Balance at End of Period	265,500	202,394	180,687
Valuation allowance for deferred tax asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	21,929	21,621	18,900
Charged to Expense	0	308	2,721
Charged to Other Accounts	0	0	0
Deductions	2,064	0	0
Balance at End of Period	$ 19,865	$ 21,929	$ 21,621