Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Dec. 31, 2018	Feb. 19, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	FCN
Entity Registrant Name	FTI CONSULTING INC
Entity Central Index Key	0000887936
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		37,863,716
Entity Public Float			$ 2.3

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 312,069	$ 189,961
Accounts receivable:
Billed receivables	437,797	390,996
Unbilled receivables	319,205	312,569
Allowance for doubtful accounts and unbilled services	(202,394)	(180,687)
Accounts receivable, net	554,608	522,878
Current portion of notes receivable	29,228	25,691
Prepaid expenses and other current assets	69,448	55,649
Total current assets	965,353	794,179
Property and equipment, net	84,577	75,075
Goodwill	1,172,316	1,204,803
Other intangible assets, net	34,633	44,150
Notes receivable, net	84,471	98,105
Other assets	37,771	40,929
Total assets	2,379,121	2,257,241
Current liabilities
Accounts payable, accrued expenses and other	104,600	94,873
Accrued compensation	333,536	268,513
Billings in excess of services provided	44,434	46,942
Total current liabilities	482,570	410,328
Long-term debt, net	265,571	396,284
Deferred income taxes	155,088	124,471
Other liabilities	127,067	134,187
Total liabilities	1,030,296	1,065,270
Commitments and contingent liabilities (Note 14)
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 — 38,147 (2018) and 37,729 (2017)	381	377
Additional paid-in capital	299,534	266,035
Retained earnings	1,196,727	1,045,774
Accumulated other comprehensive loss	(147,817)	(120,215)
Total stockholders' equity	1,348,825	1,191,971
Total liabilities and stockholders' equity	$ 2,379,121	$ 2,257,241

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
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)	38,147,000	37,729,000
Common stock, shares outstanding (in shares)	38,147,000	37,729,000

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenues	$ 2,027,877	$ 1,807,732	$ 1,810,394
Operating expenses
Direct cost of revenues	1,328,074	1,215,560	1,210,771
Selling, general and administrative expenses	465,636	432,013	436,716
Special charges	0	40,885	10,445
Amortization of other intangible assets	8,162	10,563	10,306
Costs and Expenses	1,801,872	1,699,021	1,668,238
Operating income	226,005	108,711	142,156
Other income (expense)
Interest income and other	4,977	3,752	10,466
Interest expense	(27,149)	(25,358)	(24,819)
Gain on sale of business	(13,031)	0	0
Loss on early extinguishment of debt	(9,072)	0	0
Other income (expense)	(18,213)	(21,606)	(14,353)
Income before income tax provision	207,792	87,105	127,803
Income tax provision	57,181	(20,857)	42,283
Net income	$ 150,611	$ 107,962	$ 85,520
Earnings per common share — basic (in dollars per share)	$ 4.06	$ 2.79	$ 2.09
Earnings per common share — diluted (in dollars per share)	$ 3.93	$ 2.75	$ 2.05
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments, net of tax expense of $373, $— and $—	$ (27,602)	$ 30,664	$ (41,884)
Other comprehensive income (loss), net of tax	(27,602)	30,664	(41,884)
Comprehensive income	$ 123,009	$ 138,626	$ 43,636

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, 2015		41,234
Beginning Balance at Dec. 31, 2015	$ 1,147,603	$ 412	$ 400,705	$ 855,481	$ (108,995)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	85,520			85,520
Other comprehensive income (loss):
Cumulative translation adjustment	(41,884)				(41,884)
Issuance of common stock in connection with:
Exercise of options (in shares)		820
Exercise of options	25,242	$ 8	25,234
Restricted share grants (in shares)		520
Restricted share grants	(5,536)	$ 5	(5,541)
Stock units issued under incentive compensation plan	1,842		1,842
Purchase and retirement of common stock (in shares)		(537)
Purchase and retirement of common stock	(21,489)	$ (5)	(21,484)
Share-based compensation	16,060		16,060
Ending Balance (in shares) at Dec. 31, 2016		42,037
Ending 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 (loss):
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)			(3,189)
Share-based compensation	$ 16,030		16,030
Ending Balance (in shares) at Dec. 31, 2017	37,729	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 (loss):
Cumulative translation adjustment	$ (27,602)				(27,602)
Issuance of common stock in connection with:
Exercise of options (in shares)	1,051	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)

Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Exercise of options, income tax expense	$ 0	$ 0	$ 2,051
Restricted share grants, settled (in shares)	58	92	137

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 150,611	$ 107,962	$ 85,520
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,536	31,177	38,700
Amortization and impairment of other intangible assets	8,162	10,563	10,306
Acquisition-related contingent consideration	479	2,291	2,164
Provision for doubtful accounts	17,872	15,386	8,912
Non-cash share-based compensation	15,577	16,030	16,920
Amortization of debt discount and issuance costs	5,456	1,984	1,985
Gain on sale of business	9,072	0	0
Gain on sale of business	(13,031)	0	0
Other	769	611	(1,204)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(72,034)	(50,831)	3,471
Notes receivable	8,987	14,928	3,145
Prepaid expenses and other assets	(2,258)	629	(2,840)
Accounts payable, accrued expenses and other	8,908	4,421	3,268
Income taxes	11,941	(25,768)	22,012
Accrued compensation	52,510	1,795	40,350
Billings in excess of services provided	(3,885)	16,447	779
Net cash provided by operating activities	230,672	147,625	233,488
Investing activities
Proceeds from sale of business	50,283	0	0
Payments for acquisition of businesses, net of cash received	0	(8,929)	(1,251)
Purchases of property and equipment	(32,270)	(32,004)	(28,935)
Other	731	295	54
Net cash provided by (used in) investing activities	18,744	(40,638)	(30,132)
Financing activities
Borrowings (repayments) under revolving line of credit, net	(100,000)	30,000	(130,000)
Proceeds from issuance of convertible notes	316,250	0	0
Payments of long-term debt	(300,000)	0	0
Payments of debt issue and debt prepayment costs	(16,149)	0	0
Purchase and retirement of common stock	(55,738)	(168,094)	(21,489)
Net issuance of common stock under equity compensation plans	38,475	(504)	21,708
Payments for acquisition-related contingent consideration	(3,029)	(5,161)	(866)
Deposits and other	2,672	2,825	5,337
Net cash used in financing activities	(117,519)	(140,934)	(125,310)
Effect of exchange rate changes on cash and cash equivalents	(9,789)	7,750	(11,648)
Net increase (decrease) in cash and cash equivalents	122,108	(26,197)	66,398
Cash and cash equivalents, beginning of period	189,961	216,158	149,760
Cash and cash equivalents, end of period	312,069	189,961	216,158
Supplemental cash flow disclosures
Cash paid for interest	21,687	23,285	23,154
Cash paid for income taxes, net of refunds	45,568	4,929	20,270
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	1,059	1,547	1,842
Acquisition-related contingent liability	$ 0	$ 3,426	$ 0

Description of Business and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

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, Forensic and Litigation Consulting, 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. The most significant estimates made and assumptions used are the determination of the allowance for doubtful accounts and unbilled services, the assessment of the recoverability of goodwill, other intangible assets and realization of deferred tax assets, the valuation of share-based compensation 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, 2018, we derived approximately 32% of our consolidated revenues from the work of professionals who are assigned to locations outside of 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 goods or services promised in a contract to a customer, in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. Performance obligations in our contracts represent distinct or separate service streams 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 ("ASC 606"): (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. When our performance obligation(s) are satisfied over time, we determine the transaction price based on the expected probability of achieving the agreed-upon outcome and recognize revenues earned to date by applying the proportional performance method. These arrangements include conditional payments, commonly referred to as success fees, which were previously recognized when the cash was collected.

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. We also generate revenues from our on-premise software licenses. Software license revenues are generally recognized at a point in time when the customer acceptance occurs, in accordance with the provision of the arrangements.

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 depreciation expense on the equipment of our Technology segment that is used to host and process client information, as well as amortization of software. 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.

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.

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 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 all our share-based awards, we recognize forfeiture expense as forfeitures occur.

Research and Development

Research and development costs related to software development are expensed as incurred. When we have determined that technological feasibility for our software products is reached, development costs related to the project are capitalized until such products are available for general release to customers as discussed in “Capitalized Software to Be Sold, Leased or Otherwise Marketed.” Research and development expenses related to software development totaled $8.7 million, $14.9 million and $17.5 million for the years ended December 31, 2018, 2017 and 2016, respectively, and are included in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income.

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 $15.5 million, $14.8 million and $15.9 million for the years ended December 31, 2018, 2017 and 2016, 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 a probability weighted estimate of future cash flow adjusted for the expected timing of each payment. 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 adjust the discounted value of acquisition-related contingent consideration liabilities to their present value. 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 by clients or imposed by bankruptcy courts or other regulatory agencies and the inability of 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 the particular client and historical collection patterns. 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 and totaled $17.9 million, $15.4 million and $8.9 million for the years ended December 31, 2018, 2017 and 2016, 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 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 two 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 trade names, customer relationships, non-competition agreements and 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 five to 15 years.

Impairment of Long-Lived Assets

We review long-lived assets such as property and equipment 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.

Capitalized Software to Be Sold, Leased or Otherwise Marketed

We expense costs for software products that will be sold, leased or otherwise marketed until technological feasibility has been established. Thereafter, eligible software development costs are capitalized and subsequently reported at the lower of unamortized cost or net realizable value. Capitalized costs are amortized based on current and future revenues for each product with an annual minimum equal to the straight-line amortization over the remaining estimated economic life of the product. We classify software products to be sold, leased or otherwise marketed as noncurrent “Other assets” on the Consolidated Balance Sheets. Unamortized capitalized software costs were $0.2 million and $14.8 million as of December 31, 2018 and 2017, respectively. Amortization expense for capitalized software costs was $5.3 million, $6.7 million and $12.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Leases

We lease office space and equipment under non-cancelable operating leases. The leases normally provide for the payment of minimum annual rentals and may include scheduled rent increases. Some leases include provisions for renewal options of up to five years. Some of our leases for office space contain provisions whereby the future rental payments may be adjusted for increases in operating expenses above specified amounts.

We recognize rent expense under operating leases on a straight-line basis over the non-cancelable lease term. For leases with scheduled rent increases, this treatment results in a deferred rent liability, which is classified within “Other liabilities” on the Consolidated Balance Sheets. Lease inducements, such as tenant improvement allowances, cash inducements and rent abatements, are amortized on a straight-line basis over the life of the lease. Unamortized lease inducements are also included in deferred rent. Deferred rent totaled $45.1 million and $43.9 million for the years ended December 31, 2018 and 2017, respectively.

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, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards Adopted Accounting Standards In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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 March 2018, the FASB issued ASU 2018-05, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update), Income Taxes (Topic 740). ASU 2018-05 provides guidance regarding the recording of tax impacts where uncertainty exists, in the period of adoption of the 2017 U.S. Tax Cuts and Jobs Act (the “2017 Tax Act”), which allowed companies to reflect provisional amounts for those specific income tax effects of the 2017 Tax Act for which the accounting under ASC Topic 740 is incomplete but for which a reasonable estimate could be determined. The Company recognized the income tax effects of the adoption of the 2017 Tax Act in its financial statements in accordance with ASU 2018-05. The Company finalized its accounting for the income tax effects of the adoption of the 2017 Tax Act in the fourth quarter of 2018 with the filing of its tax returns. There were no material changes to the provisional amounts recorded in the 2017 financial statements in connection with the 2017 Tax Act. Accounting Standards Not yet Adopted In February 2016, the FASB issued ASU 2016-02, amended in some respects by subsequent ASUs (collectively “ASC 842”), which supersedes existing lease guidance. Under ASC 842, we will be required to record right-of-use assets and corresponding lease liabilities on the balance sheet, as well as to disclose key quantitative and qualitative information about leasing arrangements. This guidance is effective on a modified retrospective basis for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to adopt ASC 842 using a modified transition approach, effective January 1, 2019. As permitted by the guidance, prior comparative periods will not be adjusted under this method. In addition, we elected the package of practical expedients available under the guidance that allows us not to reassess whether a contract contains a lease, lease classification or initial direct costs. In preparation for adoption of the standard, the Company implemented internal controls and business process changes to enable the preparation of financial information in accordance with the standard. The standard will have a material impact on our Consolidated Balance Sheet. The most significant impact will be the recognition of right-of-use assets and lease liabilities for operating leases. The Company estimates that adoption of this standard will result in recognition of additional right-of-use assets in the range of $145.0 million and $155.0 million and additional lease liabilities in the range of $210.0 million and $220.0 million on the adoption date for operating leases. We do not currently expect that the adoption of ASC 842 will have a material impact on our results of operations or cash flow presentation. 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 modifies the disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes and 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. 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, 2018

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 stock options and restricted shares, 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 will have a dilutive impact on earnings per common share when the average market price of our common stock for a given period exceeds the conversion price of $101.38 per share. As we did not meet this threshold during the year ended December 31, 2018, any shares of common stock potentially issuable upon conversion of the 2023 Convertible Notes are excluded from the calculation of diluted earnings per share.



	Year Ended December 31,
	2018		2017		2016
Numerator — basic and diluted
Net income	$	150,611	$	107,962	$	85,520
Denominator
Weighted average number of common shares outstanding — basic	37,098		38,697		40,943
Effect of dilutive stock options	491		117		281
Effect of dilutive restricted shares	729		378		485
Weighted average number of common shares outstanding — diluted	38,318		39,192		41,709
Earnings per common share — basic	$	4.06	$	2.79	$	2.09
Earnings per common share — diluted	$	3.93	$	2.75	$	2.05
Antidilutive stock options and restricted shares	175		1,561		1,404

Revenues Revenues	12 Months Ended
Revenues Revenues	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues	Revenues Revenues recognized during the current period may include revenues recognized from performance obligations satisfied or partially satisfied in previous periods. This primarily occurs when the estimated transaction price has changed based on a re-assessment of the expected probability of achieving the agreed-upon outcome for our performance-based and contingent arrangements, resulting in a catch-up adjustment for service provided in previous periods. The aggregate amount of revenues recognized related to the catch-up adjustment due to a change in the transaction price during the year ended December 31, 2018 was $16.1 million. Unfulfilled performance obligations represent the remaining contract transaction prices allocated to the performance obligations that are unsatisfied, or partially unsatisfied, and therefore revenues have not yet been recorded. Unfulfilled performance obligations primarily consist of the remaining fees not yet recognized under our proportional performance method for both our fixed fee arrangements and the portion of performance-based and contingent arrangements that we have deemed probable. As of December 31, 2018, the aggregate amount of the transaction price allocated to unfulfilled performance obligations was $8.8 million, 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 because we determined that it is probable that we will earn a performance-based or contingent fee, but we 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 $2.4 million as of December 31, 2018 and immaterial as of December 31, 2017. Contract liabilities are defined as liabilities incurred when we have received consideration from a client but have not yet performed the agreed-upon services. This may occur when we receive advance billings before delivery and acceptance of software licenses in our Technology segment and when clients pay us upfront fees before we begin work for them. The contract liability balance was immaterial as of December 31, 2018 and December 31, 2017.

Special Charges

12 Months Ended

Dec. 31, 2018

Other Liabilities Disclosure [Abstract]

Special Charges

There were no special charges recorded during the year ended 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.

During the year ended December 31, 2016, we recorded special charges of $10.4 million. The charges related to employee terminations in our Technology segment, health solutions practice of our Forensic and Litigation Consulting segment, and corporate infrastructure group. The charges consisted of salary continuance and other contractual employee-related costs.

The following table details the special charges by segment and corporate.



	Year Ended December 31,
Special Charges by Segment	2017		2016
Corporate Finance & Restructuring	$	5,440	$	—
Forensic and Litigation Consulting	12,334		2,304
Economic Consulting	6,624		—
Technology	5,057		7,529
Strategic Communications	7,752		—
	37,207		9,833
Unallocated Corporate	3,678		612
Total	$	40,885	$	10,445

Share-Based Compensation

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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 1,746,500 shares of common stock available for grant as of December 31, 2018.

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, 2018, 2017 and 2016.



	2018				2017				2016
			Restricted				Restricted				Restricted
Income Statement Classification	Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾
Direct cost of revenues	$	780	$	9,804	$	370	$	9,691	$	2,815	$	7,530
Selling, general and administrative expenses	2,027		8,191		1,207		4,870		1,085		8,998
Special charges	—		—		—		269		56		49
Total	$	2,807	$	17,995	$	1,577	$	14,830	$	3,956	$	16,577


⁽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 year ended December 31, 2018. We used the Black-Scholes option-pricing model to determine the fair value of our option grants during the years ended December 31, 2017 and 2016 using the assumptions in the following table.



	Year Ended December 31,
Assumptions	2017	2016
Risk-free interest rate	1.60%	0.98%
Dividend yield	—%	—%
Expected term	3 years	3 years
Stock price volatility	31.94%	34.33%

A summary of our stock option activity during the year ended December 31, 2018 is presented below. The aggregate intrinsic value of stock options outstanding and exercisable, or fully vested, at December 31, 2018 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 2018 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, 2018. 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, 2017	2,258		$	40.63
Stock options granted	—		N/A
Stock options exercised	(1,051	)	$	39.55
Stock options forfeited	(272	)	$	58.93
Stock options outstanding at December 31, 2018	935		$	36.50	5.0	$	28,181
Stock options exercisable at December 31, 2018	679		$	36.59	4.5	$	20,401

Cash received from option exercises for the years ended December 31, 2018, 2017 and 2016 was $41.6 million, $4.1 million and $27.3 million, respectively. The tax benefit realized from stock options exercised totaled $4.0 million, $1.1 million and $4.8 million for the years ended December 31, 2018, 2017 and 2016, 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, 2018, 2017 and 2016 was $26.4 million, $0.9 million and $6.9 million, respectively.

The following is a summary of stock options outstanding and exercisable as of December 31, 2018.



	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	200	$	31.39	4.7	124	$	31.38
$34.33-$36.04	193	$	34.74	5.4	152	$	34.85
$36.43-$36.89	222	$	36.79	5.7	179	$	36.81
$37.09-$40.36	245	$	39.27	5.3	158	$	38.67
$41.69-$55.99	75	$	44.62	1.4	66	$	44.88
	935				679

As of December 31, 2018, there was $0.8 million of unrecognized compensation cost related to unvested stock options. That cost is expected to be recognized ratably over a weighted average period of 1.0 year.

Restricted Share Awards

A summary of our unvested restricted share activity during the year ended December 31, 2018 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2017	933		$	38.58
Restricted share awards granted	263		$	56.97
Restricted share awards vested	(188	)	$	37.11
Restricted share awards forfeited	(16	)	$	36.74
Unvested restricted share awards outstanding at December 31, 2018	992		$	43.76

As of December 31, 2018, there was $22.9 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 4.1 years. The total fair value of restricted share awards that vested during the years ended December 31, 2018, 2017 and 2016 was $10.4 million, $9.9 million and $10.4 million, respectively.

Restricted Stock Units

A summary of our restricted stock units activity during the year ended December 31, 2018 is presented below. The aggregate intrinsic value represents the total pre-tax intrinsic value based on the closing price of our common stock on the last trading day of 2018.



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Value
Restricted stock units outstanding at December 31, 2017	402		$	37.49
Restricted stock units granted	32		$	52.67
Restricted stock units released	(99	)	$	34.90
Restricted stock units forfeited	—		N/A
Restricted stock units outstanding at December 31, 2018	335		$	39.72	$	22,329

The intrinsic value of restricted stock units released reflects the market value of our common stock on the date of release. The total intrinsic value of restricted stock units released for the years ended December 31, 2018, 2017 and 2016 was $5.4 million, $4.1 million and $9.3 million, respectively.

As of December 31, 2018, there was $0.2 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 0.6 years. The total fair value of restricted stock units that vested during the years ended December 31, 2018, 2017 and 2016 was $1.7 million, $1.9 million and $2.4 million, respectively.

Performance Stock Units

A summary of our performance stock units activity during the year ended December 31, 2018 is presented below. The performance stock units are subject to market conditions based on the total shareholder return of the Company as compared with the total shareholder return of the Standard & Poor’s 500. The aggregate intrinsic value represents the total pre-tax intrinsic value based on the closing price of our common stock on the last trading day of 2018.



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Value
Performance stock units outstanding at December 31, 2017	252		$	25.71
Performance stock units granted	91		$	36.34
Performance stock units released	(29	)	$	29.11
Performance stock units forfeited	(39	)	$	29.11
Performance stock units outstanding at December 31, 2018	275		$	28.40	$	18,348

As of December 31, 2018, there was $2.1 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 0.8 years. The total fair value of performance stock units that vested during the year ended December 31, 2018 was $1.4 million. There were no performance stock units that vested during the years ended December 31, 2017 and 2016.

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, 2018, 2017 and 2016. The fair value of our stock options is calculated using the Black-Scholes option-pricing model. The fair value of our restricted stock awards and restricted stock units is determined based on the closing market price per share of our common stock on the grant date. The fair value of the performance stock units reflects the market conditions as of the grant date using a Monte Carlo simulation.



	Year Ended December 31,
	2018		2017		2016
Weighted average fair value of grants
Stock options	$	—	$	9.56	$	8.41
Restricted share awards, restricted stock units and performance stock units	$	51.73	$	38.88	$	37.64

Financial Instruments

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017.



	December 31, 2018
			Hierarchy Level
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	2,960	$	—	$	—	$	2,960
Long-term debt	316,250		—		291,837		—
Total	$	319,210	$	—	$	291,837	$	2,960



	December 31, 2017
			Hierarchy Level
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	3,750	$	—	$	—	$	3,750
Long-term debt	400,000		—		409,000		—
Total	$	403,750	$	—	$	409,000	$	3,750


⁽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.

The fair values of financial instruments not included in this table are estimated to be equal to their carrying values as of December 31, 2018 and 2017.

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 a probability-weighted discounted cash flow model. This fair value estimate represents a Level 3 measurement as it is based on significant inputs not observed in the market and reflect our own assumptions. The significant unobservable inputs used in the fair value measurements of our acquisition-related contingent consideration are our measures of the future profitability and related cash flows and discount rates. The fair value of the contingent consideration is reassessed at each reporting period by the Company based on additional information as it becomes available.

Any change in the fair value of an acquisition’s contingent consideration liability results in a remeasurement gain or loss that is recorded in “Selling, general and administrative expenses” on the Consolidated Statements of Comprehensive Income. During the year ended December 31, 2018, there was no change in the estimated fair value of future expected contingent consideration payments. During the years ended December 31, 2017 and 2016, we recorded $0.7 million and $1.4 million in expense related to increases in the fair value of future expected contingent consideration payments, respectively.

- 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

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

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 & Restructuring			Forensic and Litigation Consulting			Economic Consulting			Technology			Strategic Communications			Total
Balance at December 31, 2016
Goodwill	$	440,666		$	230,544		$	268,209		$	117,607		$	317,114		$	1,374,140
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2016	440,666			230,544			268,209			117,607			122,975			1,180,001
Acquisitions ⁽¹⁾	11,900			—			—			—			—			11,900
Foreign currency translation adjustment and other	2,250			3,175			786			133			6,558			12,902
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 ⁽²⁾	—			—			—			(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


⁽¹⁾	During the year ended December 31, 2017, we made an initial payment of $8.9 million at closing to acquire a restructuring business within our Corporate Finance & Restructuring segment. We recorded $11.9 million in goodwill as a result of the acquisition. We have included the results of the acquired business' operations in the Corporate Finance & Restructuring segment since the acquisition date.


⁽²⁾	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.

Other Intangible Assets

Other intangible assets were as follows:



		December 31, 2018						December 31, 2017
	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⁾	14.3	$	99,080	$	71,036	$	28,044	$	117,192	$	80,523	$	36,669
Acquired software	9.8	3,107		1,618		1,489		3,264		1,383		1,881
	14.2	102,187		72,654		29,533		120,456		81,906		38,550
Non-amortizing intangible assets
Trade names ⁽¹⁾	Indefinite	5,100		—		5,100		5,600		—		5,600
Total		$	107,287	$	72,654	$	34,633	$	126,056	$	81,906	$	44,150


⁽¹⁾	During the year ended December 31, 2018, we sold a business and related intangible assets within our Technology segment.

Other intangible assets with finite lives are amortized over their estimated useful lives. We recorded amortization expense of $8.2 million, $10.6 million and $10.3 million during the years ended December 31, 2018, 2017 and 2016, respectively.

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



	As of December 31, 2018 ⁽¹⁾
Year	As of December 31, 2018 ⁽¹⁾
2019	$	7,291
2020	7,176
2021	6,657
2022	4,913
2023	1,693
Thereafter	1,803
	$	29,533


⁽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, 2018

Receivables [Abstract]

Notes Receivable from Employees

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



	December 31,
	2018			2017
Notes receivable from employees — beginning	$	123,796		$	136,388
Notes granted	32,937			18,247
Repayments	(5,405		)	(7,394		)
Amortization expense	(36,418		)	(26,821		)
Cumulative translation adjustment and other	(1,211		)	3,376
Notes receivable from employees — ending	113,699			123,796
Less: current portion	(29,228		)	(25,691		)
Notes receivable from employees, net of current portion	$	84,471		$	98,105

As of December 31, 2018 and 2017, there were 294 and 270 notes outstanding, respectively. Total amortization expense for the years ended December 31, 2018, 2017 and 2016 was $36.4 million, $26.8 million and $25.6 million, respectively.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Long-Term Debt

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt

The table below summarizes the components of the Company’s long-term debt.



	December 31,
	2018			2017
2023 Convertible Notes	$	316,250		$	—
2022 Notes	—			300,000
Credit Facility	—			100,000
Total debt	316,250			400,000
Less: deferred debt discount	(43,998		)	—
Less: deferred debt issue costs	(6,681		)	(3,716		)
Long-term debt, net ⁽¹⁾	$	265,571		$	396,284
Additional paid-in capital	$	35,306		$	—
Discount attribution to equity	(1,175		)	—
Equity component, net	$	34,131		$	—


⁽¹⁾	There were no current portions of long-term debt as of December 31, 2018 and 2017.

2023 Convertible Notes

On August 20, 2018, we issued $316.3 million aggregate principal amount of the 2023 Convertible Notes, which includes the notes issued pursuant to an option granted to the initial purchasers of the 2023 Convertible Notes to purchase additional notes. 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, beginning on February 15, 2019. The 2023 Convertible Notes will mature on August 15, 2023, unless earlier converted or repurchased.

The 2023 Convertible Notes are senior unsecured obligations of the Company and will rank senior in right of payment to any of our indebtedness that is expressly subordinated in right of payment to the 2023 Convertible Notes; equal in right of payment to any of our unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness (including all amounts outstanding, from time to time, under the Credit Facility) to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of our subsidiaries.

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. The 2023 Convertible Notes may be converted 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, 2018.

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.

Debt issuance costs of $8.4 million related to the 2023 Convertible Notes were comprised primarily of discounts and commissions payable to the initial purchasers. We allocated the total amount incurred to the liability and equity components of the 2023 Convertible Notes based on their relative values. Issuance costs attributable to the liability component were $7.2 million and will be amortized to interest expense using the effective interest rate method over the expected life of the 2023 Convertible Notes. Issuance costs attributable to the equity component were netted with the equity component in stockholders' equity.

For the year ended December 31, 2018, we recognized contractual interest expense of $2.3 million and amortization of the debt discount and issuance costs of $3.0 million for the 2023 Convertible Notes. 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 line of credit maturing on June 26, 2020. In November 2018, we amended and restated the credit agreement to extend the maturity to November 30, 2023 and incurred $1.7 million of debt issuance costs (the “2018 Credit Agreement”). At the Company’s option, borrowings under the 2018 Credit Agreement 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 2018 Credit Agreement) 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 2018 Credit Agreement, we are required to pay a commitment fee rate that fluctuates between 0.20% and 0.35% per annum and the 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 2018 Credit Agreement as of December 31, 2018. The Company classified the borrowings outstanding as of December 31, 2017 as long-term debt in the accompanying Consolidated Balance Sheets as the amounts due were not contractually required or expected to be liquidated for more than one year from the applicable balance sheet date. Additionally, $1.0 million of the borrowing limit was used (and, therefore, unavailable) as of December 31, 2018 for letters of credit.

There were $3.6 million and $3.1 million of unamortized debt issue costs related to the Credit Facility as of December 31, 2018 and 2017, respectively. These amounts were included in “Other assets” on our Consolidated Balance Sheets.

Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

On December 22, 2017, 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 Company recognized the income tax effects of the 2017 Tax Act in its financial statements for the year ended December 31, 2017, in accordance with Staff Accounting Bulletin No. 118, which provides SEC staff guidance for the application of ASC Topic 740, Income Taxes. The Company finalized its accounting for the income tax effects of the 2017 Tax Act in the fourth quarter of 2018 and there was no material change.

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



	Year Ended December 31,
	2018			2017
Deferred tax assets
Allowance for doubtful accounts	$	11,792		$	11,279
Accrued vacation and bonus	23,545			23,896
Deferred rent	9,016			8,491
Share-based compensation	11,837			15,108
Notes receivable from employees	12,993			12,879
State net operating loss carryforward	3,510			3,586
Foreign net operating loss carryforward	9,857			12,075
Federal tax credit and capital loss carryforward	9,470			7,403
Deferred compensation	1,801			2,688
Other, net	1,129			7,159
Total deferred tax assets	94,950			104,564
Deferred tax liabilities
Revenue recognition	(5,087		)	(7,227		)
Property, equipment and capitalized software	(6,652		)	(2,308		)
Equity debt discount	(11,014		)	—
Goodwill and other intangible asset amortization	(199,964		)	(190,638		)
Total deferred tax liabilities	(222,717		)	(200,173		)
Foreign withholding tax	(413		)	(1,035		)
Valuation allowance	(21,929		)	(21,621		)
Net deferred tax liabilities	$	(150,109	)	$	(118,265	)

As of December 31, 2018 and 2017, the Company believes certain deferred tax assets principally associated with foreign tax credit, capital loss and foreign net operating loss carryforwards, which can be carried forward for periods ranging from 5 years to indefinite, will expire based on updated forward-looking financial information. Therefore, valuation allowances of $21.9 million and $21.6 million are recorded against the Company’s net deferred tax assets as of December 31, 2018 and 2017, respectively.

Prior to the passage of the 2017 Tax Act, the Company asserted that substantially all of the undistributed earnings of our foreign subsidiaries were considered indefinitely reinvested and accordingly, no deferred taxes were recognized. Pursuant to the provisions of the U.S. Tax Act, these earnings were subjected to U.S. federal taxation as a result of the one-time Transition Tax; however, these earnings may still be subject to foreign withholding taxes upon distribution. We have re-evaluated our historical assertion as a result of the 2017 Tax Act and determined that we no longer consider a majority of the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested. As of December 31, 2018, the Company has recognized a deferred tax liability of $0.4 million for foreign withholding tax on undistributed earnings of our foreign subsidiaries that are not indefinitely reinvested.

As of December 31, 2018, the Company has not recorded a $17.8 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,
	2018		2017		2016
Domestic	$	96,543	$	30,013	$	66,202
Foreign	111,249		57,092		61,601
Total	$	207,792	$	87,105	$	127,803

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



	Year Ended December 31,
	2018		2017			2016
Current
Federal	$	10,847	$	15,164		$	(3,326	)
State	4,447		742			1,686
Foreign	21,056		14,816			13,864
	36,350		30,722			12,224
Deferred
Federal	14,538		(47,820		)	23,182
State	503		(152		)	8,284
Foreign	5,790		(3,607		)	(1,407		)
	20,831		(51,579		)	30,059
Income tax provision (benefit)	$	57,181	$	(20,857	)	$	42,283

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,
	2018			2017			2016
Income tax expense at federal statutory rate	$	43,636		$	30,487		$	44,731
State income taxes, net of federal benefit	4,950			781			6,075
Detriment (benefit) from lower foreign tax rates	3,655			(8,500		)	(7,827		)
Valuation allowance on foreign net operating loss carryforward	(450		)	253			254
Other expenses not deductible for tax purposes	3,543			2,466			3,082
Adjustment to reserve for uncertain tax positions	(132		)	456			(3,547		)
Impact of 2017 U.S. tax reform — deferred tax	(706		)	(63,525		)	—
Impact of 2017 U.S. tax reform — Transition Tax	50			18,655			—
Sale of Ringtail business	3,798			—			—
Other adjustments, net	(1,163		)	(1,930		)	(485		)
Income tax provision (benefit)	$	57,181		$	(20,857	)	$	42,283

The income tax expense for 2018 was $57.2 million, as compared with an income tax benefit of $20.9 million in 2017. The increase in expense is primarily attributable to higher pre-tax income in 2018 as compared with 2017 and the impact of the discrete income tax benefit of $44.9 million recorded in 2017 in connection with accounting for tax effects related to the 2017 Tax Act.

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 2014. We are also no longer subject to state and local or foreign tax examinations by tax authorities for years prior to 2012.

Our liability for uncertain tax positions was $3.7 million and $2.7 million as of December 31, 2018 and 2017, respectively. The Company does not expect any of the uncertain tax positions to settle within the next 12 months. As of December 31, 2018, our accrual for the payment of tax-related interest and penalties was not significant.

Stockholders' Equity

12 Months Ended

Dec. 31, 2018

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 May 18, 2017 and December 1, 2017, our Board of Directors authorized an additional $100.0 million, respectively, increasing the Repurchase Program to an aggregate authorization of $300.0 million. No time limit has been established for the completion of the program, and the program may be suspended, discontinued or replaced by the Board of Directors at any time without prior notice. As of December 31, 2018, we have $72.6 million available under this program to repurchase additional shares.

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



	Year Ended December 31,
	2018		2017		2016
Shares of common stock repurchased and retired	756		4,674		452
Average price per share	$	53.88	$	35.94	$	41.06
Total cost	$	40,722	$	168,001	$	18,577

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.

2015 Stock Repurchase Program

On November 5, 2015, our Board of Directors authorized a six-month stock repurchase program of up to $50.0 million (the “2015 Repurchase Program”). During the year ended December 31, 2016, we repurchased and retired 85,100 shares of our common stock for an average per share price of $34.16, at a total cost of $2.9 million, which was paid in full in 2016. The 2015 Repurchase Program expired on May 5, 2016.

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2018
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 $15.2 million, $11.6 million and $11.4 million during the years ended December 31, 2018, 2017 and 2016, 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 $7.7 million, $6.4 million and $6.3 million during the years ended December 31, 2018, 2017 and 2016, respectively.

Segment Reporting

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Segment Reporting

We manage our business in five reportable segments: Corporate Finance & Restructuring ("Corporate Finance"), Forensic and Litigation Consulting ("FLC"), Economic Consulting, Technology and Strategic Communications.

Our Corporate Finance segment focuses on the strategic, operational, financial and capital needs of our clients around the world and delivers a wide range of service offerings related to restructuring, business transformation and transaction support. Our restructuring practice includes corporate restructuring, including bankruptcy and interim management services. Our business transformation and transaction support practices include financings, mergers and acquisitions (“M&A”), M&A integration, valuations and tax advice, as well as financial, operational and performance improvement services.

Our FLC segment provides law firms, companies, government clients and other interested parties with multidisciplinary, independent dispute advisory, investigations, data analytics, forensic accounting, business intelligence and risk mitigation services, as well as interim management and performance improvement services for our health solutions practice clients.

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 corporations 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 management teams and boards of directors to help them seize opportunities, manage financial, regulatory and reputational challenges, navigate market disruptions, articulate their brand, stake a competitive position, and preserve and grow their operations.

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’s share of consolidated operating income before depreciation, amortization of intangible assets, remeasurement of acquisition-related contingent consideration, special charges and goodwill impairment charges. We define Total Adjusted Segment EBITDA, a non-GAAP financial measure, as the total of Adjusted Segment EBITDA for all segments, which excludes unallocated corporate expenses. We use Adjusted Segment EBITDA to internally evaluate the financial performance of our segments because we believe it reflects current core operating performance and provides an indicator of the segment’s ability to generate cash.

The table below presents revenues and Adjusted Segment EBITDA for our reportable segments for the years ended December 31, 2018, 2017 and 2016.



	Year Ended December 31,
	2018		2017		2016
Revenues
Corporate Finance	$	564,479	$	482,041	$	483,269
FLC	520,333		462,324		457,734
Economic Consulting	533,979		496,029		500,487
Technology	185,755		174,850		177,720
Strategic Communications	223,331		192,488		191,184
Total revenues	$	2,027,877	$	1,807,732	$	1,810,394
Adjusted Segment EBITDA
Corporate Finance	$	121,660	$	82,863	$	97,688
FLC	96,821		72,705		57,882
Economic Consulting	69,955		61,964		74,102
Technology	27,387		22,171		25,814
Strategic Communications	42,918		27,732		30,458
Total Adjusted Segment EBITDA	$	358,741	$	267,435	$	285,944

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,
	2018			2017			2016
Net income	$	150,611		$	107,962		$	85,520
Add back:
Income tax provision (benefit)	57,181			(20,857		)	42,283
Interest income and other	(4,977		)	(3,752		)	(10,466		)
Interest expense	27,149			25,358			24,819
Gain on sale of business	(13,031		)	—			—
Loss on early extinguishment of debt	9,072			—			—
Unallocated corporate expenses	96,595			83,140			88,182
Segment depreciation expense	27,979			27,112			34,064
Amortization of other intangible assets	8,162			10,563			10,306
Segment special charges	—			37,207			9,833
Remeasurement of acquisition-related contingent consideration	—			702			1,403
Total Adjusted Segment EBITDA	$	358,741		$	267,435		$	285,944

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,
	2018		2017
Corporate Finance	$	707,924	$	726,176
FLC	412,667		401,905
Economic Consulting	516,123		501,471
Technology	171,002		195,399
Strategic Communications	212,147		215,083
Total segment assets	2,019,863		2,040,034
Unallocated corporate assets	359,258		217,207
Total assets	$	2,379,121	$	2,257,241

The table below details information on our revenues for the years ended December 31, 2018, 2017 and 2016. Revenues have been attributed to locations based on the location of the legal entity generating the revenues.



	Year Ended December 31,
	2018		2017		2016
United States	$	1,372,116	$	1,262,682	$	1,298,492
United Kingdom	302,576		251,843		246,236
All other foreign countries	353,185		293,207		265,666
Total revenues	$	2,027,877	$	1,807,732	$	1,810,394

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, 2018						December 31, 2017
	United States		United Kingdom		All Other Foreign Countries		United States		United Kingdom		All Other Foreign Countries
Property and equipment, net	$	59,611	$	14,023	$	10,943	$	52,709	$	14,761	$	7,605
Net assets	$	867,321	$	160,894	$	320,610	$	654,010	$	207,885	$	330,076

Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (unaudited)



	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



	Quarter Ended
	March 31			June 30			September 30			December 31
2017
Revenues	$	446,344		$	444,715		$	448,962		$	467,711
Operating expenses
Direct cost of revenues	309,072			304,071			294,851			307,566
Selling, general and administrative expenses	107,690			108,119			104,161			112,043
Special charges	—			30,074			—			10,811
Amortization of other intangible assets	2,493			2,422			2,882			2,766
	419,255			444,686			401,894			433,186
Operating income	27,089			29			47,068			34,525
Interest income and other	605			1,592			1,103			452
Interest expense	(5,801		)	(6,250		)	(6,760		)	(6,547		)
Income before income tax provision (benefit)	21,893			(4,629		)	41,411			28,430
Income tax provision (benefit)	7,877			527			9,197			(38,458		)
Net income	$	14,016		$	(5,156	)	$	32,214		$	66,888
Earnings per common share — basic ⁽¹⁾	$	0.35		$	(0.13	)	$	0.86		$	1.81
Earnings per common share — diluted ⁽¹⁾	$	0.34		$	(0.13	)	$	0.85		$	1.78
Weighted average common shares outstanding
Basic	40,527			39,555			37,431			36,906
Diluted	41,245			39,555			37,746			37,643


⁽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, 2018

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, 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
Year Ended December 31, 2016
Reserves and allowances deducted from asset accounts:
Allowance for doubtful accounts and unbilled services	$	185,754	$	8,912	$	9,501	$	25,348	$	178,819
Valuation allowance for deferred tax asset	$	13,167	$	5,733	$	—	$	—	$	18,900

* 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, 2018

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.

•

Direct Cost of Revenues

Revenues recognized during the current period may include revenues recognized from performance obligations satisfied or partially satisfied in previous periods. This primarily occurs when the estimated transaction price has changed based on a re-assessment of the expected probability of achieving the agreed-upon outcome for our performance-based and contingent arrangements, resulting in a catch-up adjustment for service provided in previous periods. The aggregate amount of revenues recognized related to the catch-up adjustment due to a change in the transaction price during the year ended December 31, 2018 was $16.1 million.

Unfulfilled performance obligations represent the remaining contract transaction prices allocated to the performance obligations that are unsatisfied, or partially unsatisfied, and therefore revenues have not yet been recorded. Unfulfilled performance obligations primarily consist of the remaining fees not yet recognized under our proportional performance method for both our fixed fee arrangements and the portion of performance-based and contingent arrangements that we have deemed probable. As of December 31, 2018, the aggregate amount of the transaction price allocated to unfulfilled performance obligations was $8.8 million, 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 because we determined that it is probable that we will earn a performance-based or contingent fee, but we 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 $2.4 million as of December 31, 2018 and immaterial as of December 31, 2017.

Contract liabilities are defined as liabilities incurred when we have received consideration from a client but have not yet performed the agreed-upon services. This may occur when we receive advance billings before delivery and acceptance of software licenses in our Technology segment and when clients pay us upfront fees before we begin work for them. The contract liability balance was immaterial as of December 31, 2018 and December 31, 2017.

Share-Based Compensation

For all our share-based awards, we recognize forfeiture expense as forfeitures occur.

Research and Development

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

Capitalized Software to Be Sold, Leased or Otherwise Marketed

Leases

Billings in Excess of Services Provided

New Accounting Standards

Adopted Accounting Standards

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("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 March 2018, the FASB issued ASU 2018-05, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update), Income Taxes (Topic 740). ASU 2018-05 provides guidance regarding the recording of tax impacts where uncertainty exists, in the period of adoption of the 2017 U.S. Tax Cuts and Jobs Act (the “2017 Tax Act”), which allowed companies to reflect provisional amounts for those specific income tax effects of the 2017 Tax Act for which the accounting under ASC Topic 740 is incomplete but for which a reasonable estimate could be determined. The Company recognized the income tax effects of the adoption of the 2017 Tax Act in its financial statements in accordance with ASU 2018-05. The Company finalized its accounting for the income tax effects of the adoption of the 2017 Tax Act in the fourth quarter of 2018 with the filing of its tax returns. There were no material changes to the provisional amounts recorded in the 2017 financial statements in connection with the 2017 Tax Act.

Accounting Standards Not yet Adopted

In February 2016, the FASB issued ASU 2016-02, amended in some respects by subsequent ASUs (collectively “ASC 842”), which supersedes existing lease guidance. Under ASC 842, we will be required to record right-of-use assets and corresponding lease liabilities on the balance sheet, as well as to disclose key quantitative and qualitative information about leasing arrangements. This guidance is effective on a modified retrospective basis for reporting periods beginning after December 15, 2018, with early adoption permitted. We elected to adopt ASC 842 using a modified transition approach, effective January 1, 2019. As permitted by the guidance, prior comparative periods will not be adjusted under this method. In addition, we elected the package of practical expedients available under the guidance that allows us not to reassess whether a contract contains a lease, lease classification or initial direct costs.

In preparation for adoption of the standard, the Company implemented internal controls and business process changes to enable the preparation of financial information in accordance with the standard. The standard will have a material impact on our Consolidated Balance Sheet. The most significant impact will be the recognition of right-of-use assets and lease liabilities for operating leases. The Company estimates that adoption of this standard will result in recognition of additional right-of-use assets in the range of $145.0 million and $155.0 million and additional lease liabilities in the range of $210.0 million and $220.0 million on the adoption date for operating leases. We do not currently expect that the adoption of ASC 842 will have a material impact on our results of operations or cash flow presentation.

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 modifies the disclosure requirements for fair value measurements. The guidance promotes a framework to help improve the effectiveness of disclosures in the notes and 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.

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.

New Accounting Pronouncements

New Accounting Standards

Adopted Accounting Standards

Accounting Standards Not yet Adopted

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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, 2018, 2017 and 2016.



	2018				2017				2016
			Restricted				Restricted				Restricted
Income Statement Classification	Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾		Options ⁽¹⁾		Shares ⁽²⁾
Direct cost of revenues	$	780	$	9,804	$	370	$	9,691	$	2,815	$	7,530
Selling, general and administrative expenses	2,027		8,191		1,207		4,870		1,085		8,998
Special charges	—		—		—		269		56		49
Total	$	2,807	$	17,995	$	1,577	$	14,830	$	3,956	$	16,577


⁽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	2016
Risk-free interest rate	1.60%	0.98%
Dividend yield	—%	—%
Expected term	3 years	3 years
Stock price volatility	31.94%	34.33%

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, 2017	2,258		$	40.63
Stock options granted	—		N/A
Stock options exercised	(1,051	)	$	39.55
Stock options forfeited	(272	)	$	58.93
Stock options outstanding at December 31, 2018	935		$	36.50	5.0	$	28,181
Stock options exercisable at December 31, 2018	679		$	36.59	4.5	$	20,401

Schedule of Stock Options Outstanding and Exercisable

The following is a summary of stock options outstanding and exercisable as of December 31, 2018.



	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	200	$	31.39	4.7	124	$	31.38
$34.33-$36.04	193	$	34.74	5.4	152	$	34.85
$36.43-$36.89	222	$	36.79	5.7	179	$	36.81
$37.09-$40.36	245	$	39.27	5.3	158	$	38.67
$41.69-$55.99	75	$	44.62	1.4	66	$	44.88
	935				679

Schedule of Unvested Restricted Share Activity

A summary of our unvested restricted share activity during the year ended December 31, 2018 is presented below.



	Shares		Weighted Average Grant Date Fair Value
Unvested restricted share awards outstanding at December 31, 2017	933		$	38.58
Restricted share awards granted	263		$	56.97
Restricted share awards vested	(188	)	$	37.11
Restricted share awards forfeited	(16	)	$	36.74
Unvested restricted share awards outstanding at December 31, 2018	992		$	43.76

Schedule of Restricted Stock Unit Activity



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Value
Restricted stock units outstanding at December 31, 2017	402		$	37.49
Restricted stock units granted	32		$	52.67
Restricted stock units released	(99	)	$	34.90
Restricted stock units forfeited	—		N/A
Restricted stock units outstanding at December 31, 2018	335		$	39.72	$	22,329

Schedule of Performance Stock Units Activity



	Shares		Weighted Average Grant Date Fair Value		Intrinsic Value
Performance stock units outstanding at December 31, 2017	252		$	25.71
Performance stock units granted	91		$	36.34
Performance stock units released	(29	)	$	29.11
Performance stock units forfeited	(39	)	$	29.11
Performance stock units outstanding at December 31, 2018	275		$	28.40	$	18,348

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,
	2018		2017		2016
Weighted average fair value of grants
Stock options	$	—	$	9.56	$	8.41
Restricted share awards, restricted stock units and performance stock units	$	51.73	$	38.88	$	37.64

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 and 2017.



	December 31, 2018
			Hierarchy Level
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	2,960	$	—	$	—	$	2,960
Long-term debt	316,250		—		291,837		—
Total	$	319,210	$	—	$	291,837	$	2,960



	December 31, 2017
			Hierarchy Level
	Carrying Amount		Level 1		Level 2		Level 3
Liabilities
Acquisition-related contingent consideration, including current portion ⁽¹⁾	$	3,750	$	—	$	—	$	3,750
Long-term debt	400,000		—		409,000		—
Total	$	403,750	$	—	$	409,000	$	3,750


⁽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.

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

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 & Restructuring			Forensic and Litigation Consulting			Economic Consulting			Technology			Strategic Communications			Total
Balance at December 31, 2016
Goodwill	$	440,666		$	230,544		$	268,209		$	117,607		$	317,114		$	1,374,140
Accumulated goodwill impairment	—			—			—			—			(194,139		)	(194,139		)
Goodwill, net at December 31, 2016	440,666			230,544			268,209			117,607			122,975			1,180,001
Acquisitions ⁽¹⁾	11,900			—			—			—			—			11,900
Foreign currency translation adjustment and other	2,250			3,175			786			133			6,558			12,902
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 ⁽²⁾	—			—			—			(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


⁽¹⁾	During the year ended December 31, 2017, we made an initial payment of $8.9 million at closing to acquire a restructuring business within our Corporate Finance & Restructuring segment. We recorded $11.9 million in goodwill as a result of the acquisition. We have included the results of the acquired business' operations in the Corporate Finance & Restructuring segment since the acquisition date.


⁽²⁾	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.

Schedule of Other Intangible Assets Amortized Intangibles

Other intangible assets were as follows:



		December 31, 2018						December 31, 2017
	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⁾	14.3	$	99,080	$	71,036	$	28,044	$	117,192	$	80,523	$	36,669
Acquired software	9.8	3,107		1,618		1,489		3,264		1,383		1,881
	14.2	102,187		72,654		29,533		120,456		81,906		38,550
Non-amortizing intangible assets
Trade names ⁽¹⁾	Indefinite	5,100		—		5,100		5,600		—		5,600
Total		$	107,287	$	72,654	$	34,633	$	126,056	$	81,906	$	44,150


⁽¹⁾	During the year ended December 31, 2018, we sold a business and related intangible assets within our Technology segment

Schedule of Other Intangible Assets Unamortized Intangibles

Other intangible assets were as follows:



		December 31, 2018						December 31, 2017
	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⁾	14.3	$	99,080	$	71,036	$	28,044	$	117,192	$	80,523	$	36,669
Acquired software	9.8	3,107		1,618		1,489		3,264		1,383		1,881
	14.2	102,187		72,654		29,533		120,456		81,906		38,550
Non-amortizing intangible assets
Trade names ⁽¹⁾	Indefinite	5,100		—		5,100		5,600		—		5,600
Total		$	107,287	$	72,654	$	34,633	$	126,056	$	81,906	$	44,150


⁽¹⁾	During the year ended December 31, 2018, we sold a business and related intangible assets within our Technology 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, 2018 ⁽¹⁾
Year	As of December 31, 2018 ⁽¹⁾
2019	$	7,291
2020	7,176
2021	6,657
2022	4,913
2023	1,693
Thereafter	1,803
	$	29,533


⁽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.

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Summary of Components of Debt Obligations

The table below summarizes the components of the Company’s long-term debt.



	December 31,
	2018			2017
2023 Convertible Notes	$	316,250		$	—
2022 Notes	—			300,000
Credit Facility	—			100,000
Total debt	316,250			400,000
Less: deferred debt discount	(43,998		)	—
Less: deferred debt issue costs	(6,681		)	(3,716		)
Long-term debt, net ⁽¹⁾	$	265,571		$	396,284
Additional paid-in capital	$	35,306		$	—
Discount attribution to equity	(1,175		)	—
Equity component, net	$	34,131		$	—


⁽¹⁾	There were no current portions of long-term debt as of December 31, 2018 and 2017.

- 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.

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+ Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018			2017
Deferred tax assets
Allowance for doubtful accounts	$	11,792		$	11,279
Accrued vacation and bonus	23,545			23,896
Deferred rent	9,016			8,491
Share-based compensation	11,837			15,108
Notes receivable from employees	12,993			12,879
State net operating loss carryforward	3,510			3,586
Foreign net operating loss carryforward	9,857			12,075
Federal tax credit and capital loss carryforward	9,470			7,403
Deferred compensation	1,801			2,688
Other, net	1,129			7,159
Total deferred tax assets	94,950			104,564
Deferred tax liabilities
Revenue recognition	(5,087		)	(7,227		)
Property, equipment and capitalized software	(6,652		)	(2,308		)
Equity debt discount	(11,014		)	—
Goodwill and other intangible asset amortization	(199,964		)	(190,638		)
Total deferred tax liabilities	(222,717		)	(200,173		)
Foreign withholding tax	(413		)	(1,035		)
Valuation allowance	(21,929		)	(21,621		)
Net deferred tax liabilities	$	(150,109	)	$	(118,265	)

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,
	2018		2017		2016
Domestic	$	96,543	$	30,013	$	66,202
Foreign	111,249		57,092		61,601
Total	$	207,792	$	87,105	$	127,803

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,
	2018		2017			2016
Current
Federal	$	10,847	$	15,164		$	(3,326	)
State	4,447		742			1,686
Foreign	21,056		14,816			13,864
	36,350		30,722			12,224
Deferred
Federal	14,538		(47,820		)	23,182
State	503		(152		)	8,284
Foreign	5,790		(3,607		)	(1,407		)
	20,831		(51,579		)	30,059
Income tax provision (benefit)	$	57,181	$	(20,857	)	$	42,283

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,
	2018			2017			2016
Income tax expense at federal statutory rate	$	43,636		$	30,487		$	44,731
State income taxes, net of federal benefit	4,950			781			6,075
Detriment (benefit) from lower foreign tax rates	3,655			(8,500		)	(7,827		)
Valuation allowance on foreign net operating loss carryforward	(450		)	253			254
Other expenses not deductible for tax purposes	3,543			2,466			3,082
Adjustment to reserve for uncertain tax positions	(132		)	456			(3,547		)
Impact of 2017 U.S. tax reform — deferred tax	(706		)	(63,525		)	—
Impact of 2017 U.S. tax reform — Transition Tax	50			18,655			—
Sale of Ringtail business	3,798			—			—
Other adjustments, net	(1,163		)	(1,930		)	(485		)
Income tax provision (benefit)	$	57,181		$	(20,857	)	$	42,283

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018, 2017 and 2016.



	Year Ended December 31,
	2018		2017		2016
Revenues
Corporate Finance	$	564,479	$	482,041	$	483,269
FLC	520,333		462,324		457,734
Economic Consulting	533,979		496,029		500,487
Technology	185,755		174,850		177,720
Strategic Communications	223,331		192,488		191,184
Total revenues	$	2,027,877	$	1,807,732	$	1,810,394
Adjusted Segment EBITDA
Corporate Finance	$	121,660	$	82,863	$	97,688
FLC	96,821		72,705		57,882
Economic Consulting	69,955		61,964		74,102
Technology	27,387		22,171		25,814
Strategic Communications	42,918		27,732		30,458
Total Adjusted Segment EBITDA	$	358,741	$	267,435	$	285,944

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



	Year Ended December 31,
	2018			2017			2016
Net income	$	150,611		$	107,962		$	85,520
Add back:
Income tax provision (benefit)	57,181			(20,857		)	42,283
Interest income and other	(4,977		)	(3,752		)	(10,466		)
Interest expense	27,149			25,358			24,819
Gain on sale of business	(13,031		)	—			—
Loss on early extinguishment of debt	9,072			—			—
Unallocated corporate expenses	96,595			83,140			88,182
Segment depreciation expense	27,979			27,112			34,064
Amortization of other intangible assets	8,162			10,563			10,306
Segment special charges	—			37,207			9,833
Remeasurement of acquisition-related contingent consideration	—			702			1,403
Total Adjusted Segment EBITDA	$	358,741		$	267,435		$	285,944

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,
	2018		2017
Corporate Finance	$	707,924	$	726,176
FLC	412,667		401,905
Economic Consulting	516,123		501,471
Technology	171,002		195,399
Strategic Communications	212,147		215,083
Total segment assets	2,019,863		2,040,034
Unallocated corporate assets	359,258		217,207
Total assets	$	2,379,121	$	2,257,241

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



	Year Ended December 31,
	2018		2017		2016
United States	$	1,372,116	$	1,262,682	$	1,298,492
United Kingdom	302,576		251,843		246,236
All other foreign countries	353,185		293,207		265,666
Total revenues	$	2,027,877	$	1,807,732	$	1,810,394

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



	December 31, 2018						December 31, 2017
	United States		United Kingdom		All Other Foreign Countries		United States		United Kingdom		All Other Foreign Countries
Property and equipment, net	$	59,611	$	14,023	$	10,943	$	52,709	$	14,761	$	7,605
Net assets	$	867,321	$	160,894	$	320,610	$	654,010	$	207,885	$	330,076

Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data



	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



	Quarter Ended
	March 31			June 30			September 30			December 31
2017
Revenues	$	446,344		$	444,715		$	448,962		$	467,711
Operating expenses
Direct cost of revenues	309,072			304,071			294,851			307,566
Selling, general and administrative expenses	107,690			108,119			104,161			112,043
Special charges	—			30,074			—			10,811
Amortization of other intangible assets	2,493			2,422			2,882			2,766
	419,255			444,686			401,894			433,186
Operating income	27,089			29			47,068			34,525
Interest income and other	605			1,592			1,103			452
Interest expense	(5,801		)	(6,250		)	(6,760		)	(6,547		)
Income before income tax provision (benefit)	21,893			(4,629		)	41,411			28,430
Income tax provision (benefit)	7,877			527			9,197			(38,458		)
Net income	$	14,016		$	(5,156	)	$	32,214		$	66,888
Earnings per common share — basic ⁽¹⁾	$	0.35		$	(0.13	)	$	0.86		$	1.81
Earnings per common share — diluted ⁽¹⁾	$	0.34		$	(0.13	)	$	0.85		$	1.78
Weighted average common shares outstanding
Basic	40,527			39,555			37,431			36,906
Diluted	41,245			39,555			37,746			37,643


⁽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, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 20, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of reportable business segments \| segment	5
Research and development costs related to software development	$ 8,700,000	$ 14,900,000	$ 17,500,000
Advertising costs	15,500,000	14,800,000	15,900,000
Provision for doubtful accounts	$ 17,872,000	15,386,000	8,912,000
Forgivable loans, forgiveness period, minimum	2 years
Forgivable loans, forgiveness period, maximum	10 years
Definite-lived intangible assets amortization period	14 years 2 months 12 days
Unamortized capitalized software cost	$ 200,000	14,800,000
Amortization of capitalized software cost	5,300,000	6,700,000	$ 12,000,000
Deferred rent	$ 45,100,000	$ 43,900,000
Minimum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Definite-lived intangible assets amortization period	5 years
Maximum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Definite-lived intangible assets amortization period	15 years
Lease provisions for renewal options	5 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	32.00%
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				$ 316,300,000.0

New Accounting Standards (Detail) - Accounting Standards Update 2016-02 - Forecast $ in Millions	Jan. 01, 2019 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 145.0
Lease liability	210.0
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	155.0
Lease liability	$ 220.0

Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Common Share [Line Items]
Conversion price (in dollars per share)	$ 101.38								$ 101.38
Numerator — basic and diluted
Net income	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 66,888	$ 32,214	$ (5,156)	$ 14,016	$ 150,611	$ 107,962	$ 85,520
Denominator
Weighted average number of common shares outstanding — basic (in shares)	37,368	37,318	37,001	36,700	36,906	37,431	39,555	40,527	37,098	38,697	40,943
Effect of dilutive stock options (in shares)									491	117	281
Effect of dilutive restricted shares (in shares)									729	378	485
Weighted average number of common shares outstanding — diluted (in shares)	38,628	38,756	38,271	37,612	37,643	37,746	39,555	41,245	38,318	39,192	41,709
Earnings per common share — basic (in dollars per share)	$ 0.63	$ 1.19	$ 1.18	$ 1.06	$ 1.81	$ 0.86	$ (0.13)	$ 0.35	$ 4.06	$ 2.79	$ 2.09
Earnings per common share — diluted (in dollars per share)	$ 0.61	$ 1.14	$ 1.14	$ 1.04	$ 1.78	$ 0.85	$ (0.13)	$ 0.34	$ 3.93	$ 2.75	$ 2.05
Stock Options And Restricted Shares
Denominator
Antidilutive stock options and restricted shares (in shares)									175	1,561	1,404

Revenues (Details) $ in Millions	12 Months Ended
Revenues (Details) $ in Millions	Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Revenues recognized related to catch-up adjustment	$ 16.1
Amount of remaining performance obligation	$ 8.8
Remaining period of performance obligation	24 months
Contract asset balance	$ 2.4

Special Charges - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 40,885	$ 10,445
Employee Severance
Restructuring Cost and Reserve [Line Items]
Special charges		23,500
Contract Termination
Restructuring Cost and Reserve [Line Items]
Special charges		14,400
Other Restructuring
Restructuring Cost and Reserve [Line Items]
Special charges		$ 3,000

Special Charges - Schedule of Special Charges By Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 40,885	$ 10,445
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges		37,207	9,833
Operating Segments \| Corporate Finance & Restructuring
Restructuring Cost and Reserve [Line Items]
Special charges		5,440	0
Operating Segments \| Forensic and Litigation Consulting
Restructuring Cost and Reserve [Line Items]
Special charges		12,334	2,304
Operating Segments \| Economic Consulting
Restructuring Cost and Reserve [Line Items]
Special charges		6,624	0
Operating Segments \| Technology
Restructuring Cost and Reserve [Line Items]
Special charges		5,057	7,529
Operating Segments \| Strategic Communications
Restructuring Cost and Reserve [Line Items]
Special charges		7,752	0
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges		$ 3,678	$ 612

Interest Income and Other (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Interest Income and Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Income and Expenses [Abstract]
Interest income									$ 5,448	$ 3,968	$ 4,420
Foreign exchange transaction gains (losses), net									261	(77)	4,937
Other									(732)	(139)	1,109
Total	$ 2,903	$ 1,400	$ 2,474	$ (1,800)	$ 452	$ 1,103	$ 1,592	$ 605	$ 4,977	$ 3,752	$ 10,466

Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)	0
Cash received from option exercises	$ 41.6	$ 4.1	$ 27.3
Tax benefit realized from stock options exercised	4.0	1.1	4.8
Intrinsic value of options exercised	26.4	0.9	6.9
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 0.8
Unrecognized compensation cost, recognition period (in years)	1 year
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 22.9
Unrecognized compensation cost, recognition period (in years)	4 years 1 month
Fair value, vested	$ 10.4	9.9	10.4
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 0.2
Unrecognized compensation cost, recognition period (in years)	7 months 5 days
Fair value, vested	$ 1.7	1.9	2.4
Released intrinsic value	5.4	$ 4.1	$ 9.3
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2.1
Unrecognized compensation cost, recognition period (in years)	9 months 18 days
Fair value, vested	$ 1.4
Omnibus Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available for grant (in shares)	1,746,500

Share-Based Compensation - Schedule of Share-based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 2,807	$ 1,577	$ 3,956
Stock options \| Direct cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	780	370	2,815
Stock options \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	2,027	1,207	1,085
Stock options \| Special charges
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	0	0	56
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	17,995	14,830	16,577
Restricted Shares \| Direct cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	9,804	9,691	7,530
Restricted Shares \| Selling, general and administrative expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	8,191	4,870	8,998
Restricted Shares \| Special charges
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total share-based compensation expense	$ 0	$ 269	$ 49

Share-Based Compensation - Schedule of Stock Option and Grants Using Valuation Assumptions (Detail) - Stock options	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as a percent)		1.60%	0.98%
Dividend yield (as a percent)		0.00%	0.00%
Expected term	3 years	3 years
Stock price volatility (as a percent)		31.94%	34.33%

Share-Based Compensation - Schedule of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Options
Stock options outstanding beginning of period (in shares)	2,258,000
Stock options granted (in shares)	0
Stock options exercised (in shares)	(1,051,000)
Stock options forfeited (in shares)	(272,000)
Stock options outstanding end of period (in shares)	935,000
Stock options exercisable at end of period (in shares)	679,000
Weighted Average Exercise Price
Stock options outstanding, Weighted Average Exercise Price, beginning of period (in dollars per share) \| $ / shares	$ 40.63
Stock options exercised, Weighted Average Exercise Price (in dollars per share) \| $ / shares	39.55
Stock options forfeited, Weighted Average Exercise Price (in dollars per share) \| $ / shares	58.93
Stock options outstanding, Weighted Average Exercise Price, end of period (in dollars per share) \| $ / shares	36.50
Stock options exercisable, end of period, Weighted Average Exercise Price (in dollars per share) \| $ / shares	$ 36.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years
Stock options exercisable, Weighted Average Remaining Contractual Term (in Years)	4 years 6 months
Stock options outstanding, Aggregate Intrinsic Value \| $	$ 28,181
Stock options exercisable, Aggregate Intrinsic Value \| $	$ 20,401

Share-Based Compensation - Schedule of Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding, Shares \| shares	935,000
Options Exercisable, Shares \| shares	679,000
$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, Shares \| shares	200,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 31.39
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	4 years 8 months 12 days
Options Exercisable, Shares \| shares	124,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 31.38
$34.33-$36.04
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)	$ 36.04
Options Outstanding, Shares \| shares	193,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 34.74
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 4 months 25 days
Options Exercisable, Shares \| shares	152,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 34.85
$36.43-$36.89
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	36.43
Exercise Price Range, maximum (in dollars per share)	$ 39.89
Options Outstanding, Shares \| shares	222,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 36.79
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 8 months 12 days
Options Exercisable, Shares \| shares	179,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 36.81
$37.09-$40.36
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise Price Range, minimum (in dollars per share)	37.09
Exercise Price Range, maximum (in dollars per share)	$ 40.36
Options Outstanding, Shares \| shares	245,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 39.27
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	5 years 3 months 18 days
Options Exercisable, Shares \| shares	158,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 38.67
$41.69-$55.99
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)	$ 55.99
Options Outstanding, Shares \| shares	75,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 44.62
Options Outstanding, Weighted Average Remaining Contractual Term (in Years)	1 year 4 months 25 days
Options Exercisable, Shares \| shares	66,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 44.88

Share-Based Compensation - Schedule of Unvested Restricted Share Activity (Detail) - Restricted Shares shares in Thousands	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares) \| shares	933
Awards granted (in shares) \| shares	263
Awards vested (in shares) \| shares	(188)
Awards forfeited (in shares) \| shares	(16)
Unvested share awards outstanding, end of period (in shares) \| shares	992
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 38.58
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	56.97
Restricted share awards vested, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	37.11
Awards forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	36.74
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 43.76

Share-Based Compensation - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares)	402
Awards granted (in shares)	32
Awards released (in shares)	(99)
Awards forfeited (in shares)	0
Unvested share awards outstanding, end of period (in shares)	335
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 37.49
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	52.67
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	34.90
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 39.72
Unvested share awards outstanding, Intrinsic Value \| $	$ 22,329

Share-Based Compensation - Schedule of Performance Stock Units Activity (Detail) - Performance Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Shares
Unvested share awards outstanding, beginning of period (in shares) \| shares	252
Awards granted (in shares) \| shares	91
Awards released (in shares) \| shares	(29)
Awards forfeited (in shares) \| shares	(39)
Unvested share awards outstanding, end of period (in shares) \| shares	275
Weighted Average Grant Date Fair Value
Unvested share awards, Weighted Average Grant Date Fair Value, Beginning of Period (in dollars per share) \| $ / shares	$ 25.71
Awards granted, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	36.34
Awards released, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	29.11
Awards forfeited, Weighted Average Grant Date Fair Value (in dollars per share) \| $ / shares	29.11
Unvested share awards, Weighted Average Grant Date Fair Value, End of Period (in dollars per share) \| $ / shares	$ 28.40
Unvested share awards outstanding, Intrinsic Value \| $	$ 18,348

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, 2018	Dec. 31, 2017	Dec. 31, 2016
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)	$ 0.00	$ 9.56	$ 8.41
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)	$ 51.73	$ 38.88	$ 37.64

Balance Sheet Details (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Prepaid expenses and other current assets
Prepaid expenses	$ 35,762	$ 35,667
Income tax receivable	18,947	7,194
Other current assets	14,739	12,788
Total	69,448	55,649
Accounts payable, accrued expenses and other
Accounts payable	17,728	14,078
Accrued expenses	52,461	45,676
Accrued interest payable	2,358	2,354
Accrued taxes payable	13,119	12,075
Other current liabilities	18,934	20,690
Total	$ 104,600	$ 94,873

Financial Instruments - Carrying And Estimated Fair Value Of Other Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	$ 2,960	$ 3,750
Long-term debt	316,250	400,000
Total	319,210	403,750
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	291,837	409,000
Total	291,837	409,000
Level 3 \| Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	2,960	3,750
Long-term debt	0	0
Total	$ 2,960	$ 3,750

Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 232,560	$ 212,740
Accumulated depreciation	(147,983)	(137,665)
Property and equipment, net	84,577	75,075
Depreciation expense for property and equipment	26,200	24,400	$ 26,700
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	88,623	77,921
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,754	806
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,865	33,827
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 106,318	$ 100,186

Goodwill and Other Intangible Assets - Summary of Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill	$ 1,398,942	$ 1,374,140
Accumulated goodwill impairment	(194,139)	(194,139)
Goodwill beginning of period	1,204,803	1,180,001
Sale of business	(20,928)
Acquisitions		11,900
Foreign currency translation adjustment and other	(11,559)	12,902
Goodwill	1,366,455	1,398,942	$ 1,374,140
Accumulated goodwill impairment	(194,139)	(194,139)	(194,139)
Goodwill end of period	1,172,316	1,204,803	1,180,001
Proceeds from sale of business	50,283	0	0
Corporate Finance
Goodwill [Roll Forward]
Goodwill	454,816	440,666
Goodwill beginning of period	454,816	440,666
Acquisitions		11,900
Foreign currency translation adjustment and other	(3,819)	2,250
Goodwill	450,997	454,816	440,666
Goodwill end of period	450,997	454,816	440,666
Forensic and Litigation Consulting
Goodwill [Roll Forward]
Goodwill	233,719	230,544
Goodwill beginning of period	233,719	230,544
Foreign currency translation adjustment and other	(2,182)	3,175
Goodwill	231,537	233,719	230,544
Goodwill end of period	231,537	233,719	230,544
Economic Consulting
Goodwill [Roll Forward]
Goodwill	268,995	268,209
Goodwill beginning of period	268,995	268,209
Foreign currency translation adjustment and other	(448)	786
Goodwill	268,547	268,995	268,209
Goodwill end of period	268,547	268,995	268,209
Technology
Goodwill [Roll Forward]
Goodwill	117,740	117,607
Goodwill beginning of period	117,740	117,607
Sale of business	(20,928)
Acquisitions	20,900
Foreign currency translation adjustment and other	(89)	133
Goodwill	96,723	117,740	117,607
Goodwill end of period	96,723	117,740	117,607
Proceeds from sale of business	50,300	8,900
Strategic Communications
Goodwill [Roll Forward]
Goodwill	323,672	317,114
Accumulated goodwill impairment	(194,139)	(194,139)
Goodwill beginning of period	129,533	122,975
Foreign currency translation adjustment and other	(5,021)	6,558
Goodwill	318,651	323,672	317,114
Accumulated goodwill impairment	(194,139)	(194,139)	(194,139)
Goodwill end of period	$ 124,512	129,533	$ 122,975
Restructuring Business \| Technology
Goodwill [Roll Forward]
Sale of business		$ (11,900)

Goodwill and Other Intangible Assets - Intangible Assets by Major Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
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	$ 102,187	$ 120,456
Amortized intangible assets, Accumulated Amortization	72,654	81,906
Amortized intangible assets, Net Carrying Amount	29,533	38,550
Intangible assets, Gross Carrying Amount	107,287	126,056
Intangible assets, Net Carrying Amount	34,633	44,150
Trade names (1)
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Gross Carrying Amount	$ 5,100	5,600
Customer relationships (1)
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	14 years 3 months 18 days
Amortized intangible assets, Gross Carrying Amount	$ 99,080	117,192
Amortized intangible assets, Accumulated Amortization	71,036	80,523
Amortized intangible assets, Net Carrying Amount	$ 28,044	36,669
Acquired software
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Weighted Average Useful Life in Years	9 years 9 months 18 days
Amortized intangible assets, Gross Carrying Amount	$ 3,107	3,264
Amortized intangible assets, Accumulated Amortization	1,618	1,383
Amortized intangible assets, Net Carrying Amount	$ 1,489	$ 1,881

Goodwill and Other Intangible Assets - Schedule of Future Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 7,291
2020	7,176
2021	6,657
2022	4,913
2023	1,693
Thereafter	1,803
Amortized intangible assets, Net Carrying Amount	$ 29,533	$ 38,550

Notes Receivable from Employees - Summary of Changes in Carrying Amount of Notes Receivable From Employees (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable, Related Parties [Roll Forward]
Notes receivable from employees — beginning	$ 123,796	$ 136,388
Notes granted	32,937	18,247
Repayments	(5,405)	(7,394)
Amortization expense	(36,418)	(26,821)
Cumulative translation adjustment and other	(1,211)	3,376
Notes receivable from employees — ending	$ 123,796	$ 136,388	$ 113,699	$ 123,796
Less: current portion			(29,228)	(25,691)
Notes receivable from employees, net of current portion			$ 84,471	$ 98,105

Long-Term Debt - Summary of Components of Long-Term Debt Obligations (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 316,250,000	$ 400,000,000
Long-term debt, net	265,571,000	396,284,000
Long-term debt, current portion	0
Credit facility
Debt Instrument [Line Items]
Total debt	0	100,000,000
Convertible Debt
Debt Instrument [Line Items]
Less: deferred debt discount	(1,175,000)	0
Convertible Debt \| Convertible Note Due 2023
Debt Instrument [Line Items]
Total debt	316,250,000	0
Less: deferred debt discount	(43,998,000)	0
Less: deferred debt issue costs	(6,681,000)	(3,716,000)
Additional paid-in capital	35,306,000	0
Equity component, net	34,131,000	0
Convertible Debt \| 6% senior notes due 2022
Debt Instrument [Line Items]
Total debt	$ 0	$ 300,000,000

Long-Term Debt - Additional Information (Detail)			1 Months Ended	3 Months Ended				12 Months Ended
Long-Term Debt - Additional Information (Detail)	Nov. 15, 2018 USD ($)	Aug. 20, 2018 USD ($) $ / shares	Nov. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Conversion price (in dollars per share) \| $ / shares				$ 101.38				$ 101.38
Gain on sale of business				$ (9,072,000)	$ 0	$ 0	$ 0	$ (9,072,000)	$ 0	$ 0
Senior Notes \| Convertible Note Due 2023
Debt Instrument [Line Items]
Principal amount		$ 316,300,000.0
Interest rate (as a percent)		2.00%
Conversion rate		9.8643
Conversion price (in dollars per share) \| $ / shares		$ 101.38
Debt issuance costs		$ 8,400,000
Interest expense								2,300,000
Amortization of debt issuance costs								$ 3,000,000
Effective interest rate				5.45%				5.45%
Senior Notes \| Convertible Notes 2023 Conversion Feature
Debt Instrument [Line Items]
Debt issuance costs		$ 7,200,000
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
Write off of deferred debt issuance cost	$ 3,100,000
Line of Credit \| Credit facility
Debt Instrument [Line Items]
Senior secured revolving line of credit				$ 550,000,000				$ 550,000,000
Line of credit, maturity date								Jun. 26, 2020
Debt issuance costs			$ 1,700,000
Borrowings outstanding				0				$ 0
Borrowing limit used				1,000,000				1,000,000
Unamortized debt issue costs				$ 3,600,000				$ 3,600,000	$ 3,100,000
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%

Commitments and Contingencies - Future Minimum Payments for all Operating Lease Obligations and Sublease Rental Income (Detail) $ 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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax [Line Items]
Tax benefit related to 2017 Tax Act										$ (44,900)
Valuation allowance	$ 21,929				$ 21,621				$ 21,929	21,621
Foreign withholding tax	(413)				(1,035)				(413)	(1,035)
Deferred tax liability not recognized related to tax basis difference in investment in foreign subsidiaries	17,800								17,800
Income tax provision	7,834	$ 19,964	$ 14,113	$ 15,270	(38,458)	$ 9,197	$ 527	$ 7,877	57,181	(20,857)	$ 42,283
Liability for uncertain tax positions	$ 3,700				$ 2,700				$ 3,700	$ 2,700

Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]
Allowance for doubtful accounts	$ 11,792	$ 11,279
Accrued vacation and bonus	23,545	23,896
Deferred rent	9,016	8,491
Share-based compensation	11,837	15,108
Notes receivable from employees	12,993	12,879
State net operating loss carryforward	3,510	3,586
Foreign net operating loss carryforward	9,857	12,075
Federal tax credit and capital loss carryforward	9,470	7,403
Deferred compensation	1,801	2,688
Other, net	1,129	7,159
Total deferred tax assets	94,950	104,564
Deferred tax liabilities
Revenue recognition	(5,087)	(7,227)
Property, equipment and capitalized software	(6,652)	(2,308)
Equity debt discount	(11,014)	0
Goodwill and other intangible asset amortization	(199,964)	(190,638)
Total deferred tax liabilities	(222,717)	(200,173)
Foreign withholding tax	(413)	(1,035)
Valuation allowance	(21,929)	(21,621)
Net deferred tax liabilities	$ (150,109)	$ (118,265)

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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic									$ 96,543	$ 30,013	$ 66,202
Foreign									111,249	57,092	61,601
Income before income tax provision	$ 31,558	$ 64,297	$ 57,722	$ 54,215	$ 28,430	$ 41,411	$ (4,629)	$ 21,893	$ 207,792	$ 87,105	$ 127,803

Income Taxes - Summary of Components of Income Tax Provision from Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal									$ 10,847	$ 15,164	$ (3,326)
State									4,447	742	1,686
Foreign									21,056	14,816	13,864
Current, Total									36,350	30,722	12,224
Deferred
Federal									14,538	(47,820)	23,182
State									503	(152)	8,284
Foreign									5,790	(3,607)	(1,407)
Deferred, Total									20,831	(51,579)	30,059
Income tax provision (benefit)	$ 7,834	$ 19,964	$ 14,113	$ 15,270	$ (38,458)	$ 9,197	$ 527	$ 7,877	$ 57,181	$ (20,857)	$ 42,283

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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate									$ 43,636	$ 30,487	$ 44,731
State income taxes, net of federal benefit									4,950	781	6,075
Detriment (benefit) from lower foreign tax rates									3,655	(8,500)	(7,827)
Valuation allowance on foreign net operating loss carryforward									(450)	253	254
Other expenses not deductible for tax purposes									3,543	2,466	3,082
Adjustment to reserve for uncertain tax positions									(132)	456	(3,547)
Impact of 2017 U.S. tax reform — deferred tax									(706)	(63,525)	0
Impact of 2017 U.S. tax reform — Transition Tax									50	18,655	0
Sale of Ringtail business									3,798	0	0
Other adjustments, net									(1,163)	(1,930)	(485)
Income tax provision (benefit)	$ 7,834	$ 19,964	$ 14,113	$ 15,270	$ (38,458)	$ 9,197	$ 527	$ 7,877	$ 57,181	$ (20,857)	$ 42,283

Stockholders' Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Aug. 16, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Aug. 13, 2018	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016	Nov. 05, 2015
Stockholders Equity [Line Items]
Total cost		$ 55,738,000	$ 168,094,000	$ 21,489,000
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount						$ 300,000,000		$ 100,000,000
Stock repurchase program additional amount authorized						$ 100,000,000.0	$ 100,000,000
Available amount under repurchase program		$ 72,600,000
Shares of common stock repurchased and retired (in shares)		756,000	4,674,000	452,000
Average price per share (in dollars per share)		$ 53.88	$ 35.94	$ 41.06
Total cost		$ 40,722,000	$ 168,001,000	$ 18,577,000
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
2015 Stock Repurchase Program
Stockholders Equity [Line Items]
Share repurchase program authorized amount									$ 50,000,000.0
Shares of common stock repurchased and retired (in shares)				85,100
Average price per share (in dollars per share)				$ 34.16
Total cost				$ 2,900,000

Stockholders' Equity - Schedule of Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Total cost	$ 55,738	$ 168,094	$ 21,489
2016 Stock Repurchase Program
Class of Stock [Line Items]
Shares of common stock repurchased and retired (in shares)	756	4,674	452
Average price per share (in dollars per share)	$ 53.88	$ 35.94	$ 41.06
Total cost	$ 40,722	$ 168,001	$ 18,577

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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 467,711	$ 448,962	$ 444,715	$ 446,344	$ 2,027,877	$ 1,807,732	$ 1,810,394
Adjusted Segment EBITDA									358,741	267,435	285,944
Corporate Finance
Segment Reporting Information [Line Items]
Revenues									564,479	482,041	483,269
Adjusted Segment EBITDA									121,660	82,863	97,688
FLC
Segment Reporting Information [Line Items]
Revenues									520,333	462,324	457,734
Adjusted Segment EBITDA									96,821	72,705	57,882
Economic Consulting
Segment Reporting Information [Line Items]
Revenues									533,979	496,029	500,487
Adjusted Segment EBITDA									69,955	61,964	74,102
Technology
Segment Reporting Information [Line Items]
Revenues									185,755	174,850	177,720
Adjusted Segment EBITDA									27,387	22,171	25,814
Strategic Communications
Segment Reporting Information [Line Items]
Revenues									223,331	192,488	191,184
Adjusted Segment EBITDA									$ 42,918	$ 27,732	$ 30,458

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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 66,888	$ 32,214	$ (5,156)	$ 14,016	$ 150,611	$ 107,962	$ 85,520
Income tax provision (benefit)	7,834	19,964	14,113	15,270	(38,458)	9,197	527	7,877	57,181	(20,857)	42,283
Interest income and other	(2,903)	(1,400)	(2,474)	1,800	(452)	(1,103)	(1,592)	(605)	(4,977)	(3,752)	(10,466)
Interest expense	7,076	7,246	6,583	6,244	$ 6,547	$ 6,760	$ 6,250	$ 5,801	27,149	25,358	24,819
Gain on sale of business	0	(13,031)	0	0					(13,031)	0	0
Gain on sale of business	$ 9,072	$ 0	$ 0	$ 0					9,072	0	0
Adjusted Segment EBITDA									358,741	267,435	285,944
Segment Reconciling Items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income									150,611	107,962	85,520
Income tax provision (benefit)									57,181	(20,857)	42,283
Interest income and other									(4,977)	(3,752)	(10,466)
Interest expense									27,149	25,358	24,819
Gain on sale of business									(13,031)	0	0
Gain on sale of business									9,072	0	0
Unallocated corporate expenses									96,595	83,140	88,182
Segment depreciation expense									27,979	27,112	34,064
Amortization of other intangible assets									8,162	10,563	10,306
Segment special charges									0	37,207	9,833
Remeasurement of acquisition-related contingent consideration									0	702	1,403
Adjusted Segment EBITDA									$ 358,741	$ 267,435	$ 285,944

Segment Reporting - Schedule of Assets by Segments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 2,379,121	$ 2,257,241
Operating Segments
Segment Reporting Information [Line Items]
Total assets	2,019,863	2,040,034
Operating Segments \| Corporate Finance & Restructuring
Segment Reporting Information [Line Items]
Total assets	707,924	726,176
Operating Segments \| Forensic and Litigation Consulting
Segment Reporting Information [Line Items]
Total assets	412,667	401,905
Operating Segments \| Economic Consulting
Segment Reporting Information [Line Items]
Total assets	516,123	501,471
Operating Segments \| Technology
Segment Reporting Information [Line Items]
Total assets	171,002	195,399
Operating Segments \| Strategic Communications
Segment Reporting Information [Line Items]
Total assets	212,147	215,083
Unallocated corporate assets
Segment Reporting Information [Line Items]
Total assets	$ 359,258	$ 217,207

Segment Reporting - Revenues Based on Location of Legal Entity (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 467,711	$ 448,962	$ 444,715	$ 446,344	$ 2,027,877	$ 1,807,732	$ 1,810,394
United States
Segment Reporting Information [Line Items]
Revenues									1,372,116	1,262,682	1,298,492
United Kingdom
Segment Reporting Information [Line Items]
Revenues									302,576	251,843	246,236
All other foreign countries
Segment Reporting Information [Line Items]
Revenues									$ 353,185	$ 293,207	$ 265,666

Segment Reporting - Information on Long-Lived Assets and Net Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property and equipment, net	$ 84,577	$ 75,075
United States
Segment Reporting Information [Line Items]
Property and equipment, net	59,611	52,709
Net assets	867,321	654,010
United Kingdom
Segment Reporting Information [Line Items]
Property and equipment, net	14,023	14,761
Net assets	160,894	207,885
All other foreign countries
Segment Reporting Information [Line Items]
Property and equipment, net	10,943	7,605
Net assets	$ 320,610	$ 330,076

Quarterly Financial Data (unaudited) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 504,993	$ 513,012	$ 512,098	$ 497,774	$ 467,711	$ 448,962	$ 444,715	$ 446,344	$ 2,027,877	$ 1,807,732	$ 1,810,394
Operating expenses
Direct cost of revenues	340,162	336,477	330,318	321,117	307,566	294,851	304,071	309,072	1,328,074	1,215,560	1,210,771
Selling, general and administrative expenses	118,163	117,448	117,897	112,128	112,043	104,161	108,119	107,690	465,636	432,013	436,716
Special charges					10,811	0	30,074	0
Amortization of other intangible assets	1,865	1,975	2,052	2,270	2,766	2,882	2,422	2,493	8,162	10,563	10,306
Costs and Expenses	460,190	455,900	450,267	435,515	433,186	401,894	444,686	419,255	1,801,872	1,699,021	1,668,238
Operating income	44,803	57,112	61,831	62,259	34,525	47,068	29	27,089	226,005	108,711	142,156
Interest income and other	2,903	1,400	2,474	(1,800)	452	1,103	1,592	605	4,977	3,752	10,466
Interest expense	(7,076)	(7,246)	(6,583)	(6,244)	(6,547)	(6,760)	(6,250)	(5,801)	(27,149)	(25,358)	(24,819)
Gain on sale of business	0	13,031	0	0					13,031	0	0
Loss on early extinguishment of debt	(9,072)	0	0	0					(9,072)	0	0
Income before income tax provision	31,558	64,297	57,722	54,215	28,430	41,411	(4,629)	21,893	207,792	87,105	127,803
Income tax provision	7,834	19,964	14,113	15,270	(38,458)	9,197	527	7,877	57,181	(20,857)	42,283
Net income	$ 23,724	$ 44,333	$ 43,609	$ 38,945	$ 66,888	$ 32,214	$ (5,156)	$ 14,016	$ 150,611	$ 107,962	$ 85,520
Earnings per common share — basic (in dollars per share)	$ 0.63	$ 1.19	$ 1.18	$ 1.06	$ 1.81	$ 0.86	$ (0.13)	$ 0.35	$ 4.06	$ 2.79	$ 2.09
Earnings per common share — diluted (in dollars per share)	$ 0.61	$ 1.14	$ 1.14	$ 1.04	$ 1.78	$ 0.85	$ (0.13)	$ 0.34	$ 3.93	$ 2.75	$ 2.05
Weighted average common shares outstanding
Basic (in shares)	37,368	37,318	37,001	36,700	36,906	37,431	39,555	40,527	37,098	38,697	40,943
Diluted (in shares)	38,628	38,756	38,271	37,612	37,643	37,746	39,555	41,245	38,318	39,192	41,709

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts and unbilled services
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of period	$ 180,687	$ 178,819	$ 185,754
Charged to Expense	17,872	15,386	8,912
Charged to Other Accounts	25,300	9,656	9,501
Deductions	21,465	23,174	25,348
Balance at End of Period	202,394	180,687	178,819
Valuation allowance for deferred tax asset
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of period	21,621	18,900	13,167
Charged to Expense	308	2,721	5,733
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Period	$ 21,929	$ 21,621	$ 18,900

Notes Receivable from Employees - Additional information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) note	Dec. 31, 2017 USD ($) note	Dec. 31, 2016 USD ($)
Receivables [Abstract]
Notes outstanding (in notes) \| note	294	270
Amortization of forgivable loan expense \| $	$ 36.4	$ 26.8	$ 25.6

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Rental expense	$ 55.3	$ 56.0	$ 54.8

Employee Benefit Plans (Detail) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plans (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to plan	$ 15.2	$ 11.6	$ 11.4
United Kingdom
Defined Contribution Plan Disclosure [Line Items]
Employer contributions to plan	$ 7.7	$ 6.4	$ 6.3

Segment Reporting - Additional Information (Detail)	12 Months Ended
Segment Reporting - Additional Information (Detail)	Dec. 31, 2018 segment
Segment Reporting [Abstract]
Number of reportable business segments (in segments)	5