FTI Consulting (FCN) 10-Q 29 Jul 21 2021 Q2 Quarterly report Financial data

Cover

Cover - shares	6 Months Ended
	Jun. 30, 2021	Jul. 22, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-14875
Entity Registrant Name	FTI CONSULTING, INC
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	52-1261113
Entity Address, Address Line One	555 12th Street NW
Entity Address, City or Town	Washington,
Entity Address, State or Province	DC
Entity Address, Postal Zip Code	20004
City Area Code	202
Local Phone Number	312-9100
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	FCN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		34,278,447
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000887936
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 256,875	$ 294,953
Accounts receivable, net	846,121	711,357
Current portion of notes receivable	32,093	35,253
Prepaid expenses and other current assets	78,373	88,144
Total current assets	1,213,462	1,129,707
Property and equipment, net	117,477	101,642
Operating lease assets	223,618	156,645
Goodwill	1,240,057	1,234,879
Intangible assets, net	37,653	41,550
Notes receivable, net	55,675	61,121
Other assets	50,485	51,819
Total assets	2,938,427	2,777,363
Current liabilities
Accounts payable, accrued expenses and other	156,736	170,066
Accrued compensation	368,882	455,933
Billings in excess of services provided	36,944	44,172
Total current liabilities	562,562	670,171
Long-term debt, net	391,581	286,131
Noncurrent operating lease liabilities	230,133	161,677
Deferred income taxes	169,009	158,342
Other liabilities	95,932	100,861
Total liabilities	1,449,217	1,377,182
Commitments and contingencies
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 — 34,282 (2021) and 34,481 (2020)	343	345
Additional paid-in capital	4,270	0
Retained earnings	1,590,467	1,506,271
Accumulated other comprehensive loss	(105,870)	(106,435)
Total stockholders' equity	1,489,210	1,400,181
Total liabilities and stockholders' equity	$ 2,938,427	$ 2,777,363

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2021	Dec. 31, 2020
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)	34,282,000	34,481,000
Common stock, shares outstanding (in shares)	34,282,000	34,481,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenues	$ 711,486	$ 607,852	$ 1,397,763	$ 1,212,445
Operating expenses
Direct cost of revenues	490,722	413,011	959,146	815,258
Selling, general and administrative expenses	133,930	126,928	260,476	253,887
Amortization of intangible assets	2,854	2,314	5,655	4,645
Costs and Expenses	627,506	542,253	1,225,277	1,073,790
Operating income	83,980	65,599	172,486	138,655
Other income (expense)
Interest income and other	(912)	2,202	122	7,219
Interest expense	(5,294)	(5,157)	(10,091)	(10,018)
Other income (expense)	(6,206)	(2,955)	(9,969)	(2,799)
Income before income tax provision	77,774	62,644	162,517	135,856
Income tax provision	14,992	14,470	35,239	30,935
Net income	$ 62,782	$ 48,174	$ 127,278	$ 104,921
Earnings per common share — basic (in dollars per share)	$ 1.88	$ 1.33	$ 3.80	$ 2.89
Earnings per common share — diluted (in dollars per share)	$ 1.77	$ 1.27	$ 3.61	$ 2.76
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments, net of tax expense of $0	$ 5,807	$ 9,568	$ 565	$ (21,534)
Total other comprehensive income (loss), net of tax	5,807	9,568	565	(21,534)
Comprehensive income	$ 68,589	$ 57,742	$ 127,843	$ 83,387

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Foreign currency translation adjustment, tax	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Statem_3

Condensed 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, 2019		37,390
Beginning Balance at Dec. 31, 2019	$ 1,489,142	$ 374	$ 216,162	$ 1,413,453	$ (140,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	56,747			56,747
Other comprehensive income (loss)
Cumulative translation adjustment	(31,102)				(31,102)
Issuance of common stock in connection with:
Exercise of options (in shares)		34
Exercise of options	1,207	$ 1	1,206
Restricted share grants (in shares)		136
Restricted share grants	(6,767)	$ 1	(6,768)
Stock units issued under incentive compensation plan	2,314		2,314
Purchase and retirement of common stock (in shares)		(450)
Purchase and retirement of common stock	(50,311)	$ (5)	(50,306)
Share-based compensation	7,454		7,454
Ending Balance (in shares) at Mar. 31, 2020		37,110
Ending Balance at Mar. 31, 2020	1,468,684	$ 371	170,062	1,470,200	(171,949)
Beginning Balance (in shares) at Dec. 31, 2019		37,390
Beginning Balance at Dec. 31, 2019	1,489,142	$ 374	216,162	1,413,453	(140,847)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	104,921
Other comprehensive income (loss)
Cumulative translation adjustment	(21,534)
Issuance of common stock in connection with:
Stock units issued under incentive compensation plan	2,314
Ending Balance (in shares) at Jun. 30, 2020		36,710
Ending Balance at Jun. 30, 2020	1,479,103	$ 367	122,743	1,518,374	(162,381)
Beginning Balance (in shares) at Mar. 31, 2020		37,110
Beginning Balance at Mar. 31, 2020	1,468,684	$ 371	170,062	1,470,200	(171,949)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,174			48,174
Other comprehensive income (loss)
Cumulative translation adjustment	9,568				9,568
Issuance of common stock in connection with:
Exercise of options (in shares)		33
Exercise of options	1,191		1,191
Restricted share grants (in shares)		38
Restricted share grants	(2,154)	$ 1	(2,155)
Purchase and retirement of common stock (in shares)		(471)
Purchase and retirement of common stock	(51,053)	$ (5)	(51,048)
Share-based compensation	4,693		4,693
Ending Balance (in shares) at Jun. 30, 2020		36,710
Ending Balance at Jun. 30, 2020	$ 1,479,103	$ 367	122,743	1,518,374	(162,381)
Beginning Balance (in shares) at Dec. 31, 2020	34,481	34,481
Beginning Balance at Dec. 31, 2020	$ 1,400,181	$ 345	0	1,506,271	(106,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	64,496			64,496
Other comprehensive income (loss)
Cumulative translation adjustment	(5,242)				(5,242)
Issuance of common stock in connection with:
Exercise of options (in shares)		12
Exercise of options	434		434
Restricted share grants (in shares)		157
Restricted share grants	(7,231)	$ 1	(7,232)
Stock units issued under incentive compensation plan	2,603		2,603
Purchase and retirement of common stock (in shares)		(422)
Purchase and retirement of common stock	(46,133)	$ (4)	(3,047)	(43,082)
Share-based compensation	7,242		7,242
Ending Balance (in shares) at Mar. 31, 2021		34,228
Ending Balance at Mar. 31, 2021	$ 1,416,350	$ 342	0	1,527,685	(111,677)
Beginning Balance (in shares) at Dec. 31, 2020	34,481	34,481
Beginning Balance at Dec. 31, 2020	$ 1,400,181	$ 345	0	1,506,271	(106,435)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	127,278
Other comprehensive income (loss)
Cumulative translation adjustment	565
Issuance of common stock in connection with:
Stock units issued under incentive compensation plan	$ 2,603
Purchase and retirement of common stock			(3,000)
Ending Balance (in shares) at Jun. 30, 2021	34,282	34,282
Ending Balance at Jun. 30, 2021	$ 1,489,210	$ 343	4,270	1,590,467	(105,870)
Beginning Balance (in shares) at Mar. 31, 2021		34,228
Beginning Balance at Mar. 31, 2021	1,416,350	$ 342	0	1,527,685	(111,677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	62,782			62,782
Other comprehensive income (loss)
Cumulative translation adjustment	5,807				5,807
Issuance of common stock in connection with:
Exercise of options (in shares)		33
Exercise of options	1,137	$ 1	1,136
Restricted share grants (in shares)		21
Restricted share grants	(1,814)		(1,814)
Share-based compensation	$ 4,948		4,948
Ending Balance (in shares) at Jun. 30, 2021	34,282	34,282
Ending Balance at Jun. 30, 2021	$ 1,489,210	$ 343	$ 4,270	$ 1,590,467	$ (105,870)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - shares shares in Thousands	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Restricted share grants, net settled shares (in shares)	13	63	18	58

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net income	$ 127,278	$ 104,921
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	16,765	15,707
Amortization and impairment of intangible assets	5,655	4,645
Acquisition-related contingent consideration	(1,130)	1,120
Provision for expected credit losses	8,236	11,624
Share-based compensation	12,190	12,147
Amortization of debt discount and issuance costs and other	5,685	6,000
Deferred income taxes	9,802	4,128
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, billed and unbilled	(138,838)	(42,804)
Notes receivable	8,921	5,993
Prepaid expenses and other assets	6,728	8,979
Accounts payable, accrued expenses and other	(13,518)	2,230
Income taxes	6,695	(2,344)
Accrued compensation	(88,024)	(107,217)
Billings in excess of services provided	(7,471)	4,285
Net cash provided by (used in) operating activities	(41,026)	29,414
Investing activities
Payments for acquisition of businesses, net of cash received	(9,833)	0
Purchases of property and equipment and other	(27,696)	(13,885)
Net cash used in investing activities	(37,529)	(13,885)
Financing activities
Borrowings under revolving line of credit	292,500	90,000
Repayments under revolving line of credit	(192,500)	(55,000)
Purchase and retirement of common stock	(46,133)	(99,678)
Share-based compensation tax withholdings and other	(7,475)	(6,523)
Payments for business acquisition liabilities	(7,496)	(3,948)
Deposits	602	5,098
Net cash provided by (used in) financing activities	39,498	(70,051)
Effect of exchange rate changes on cash and cash equivalents	979	(10,645)
Net decrease in cash and cash equivalents	(38,078)	(65,167)
Cash and cash equivalents, beginning of period	294,953	369,373
Cash and cash equivalents, end of period	256,875	304,206
Supplemental cash flow disclosures
Cash paid for interest	4,854	3,668
Cash paid for income taxes, net of refunds	18,742	29,150
Non-cash investing and financing activities:
Issuance of stock units under incentive compensation plans	2,603	2,314
Purchase and retirement of common stock not yet paid	0	1,829
Business acquisition liabilities not yet paid	1,093	0
Non-cash additions to property and equipment	$ 4,150	$ 1,501

Basis of Presentation and Signi

Basis of Presentation and Significant Accounting Policies	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting PoliciesThe unaudited condensed consolidated financial statements of FTI Consulting, Inc., including its consolidated subsidiaries (collectively, the “Company,” “we,” “our” or “FTI Consulting”), presented herein, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and under the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial information. Some of the information and footnote disclosures normally included in annual financial statements have been condensed or omitted pursuant to those rules and regulations. Certain prior period amounts have been reclassified to conform to the current period presentation. In management’s opinion, the interim financial statements reflect all adjustments that are necessary for a fair presentation of the results for the interim periods presented. All adjustments made were normal recurring accruals. Results of operations for the interim periods presented herein are not necessarily indicative of results of operations for a full year. These financial statements should be read in conjunction with the consolidated financial statements and the notes thereto contained in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the SEC.

New Accounting Standards

New Accounting Standards	6 Months Ended
	Jun. 30, 2021
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	New Accounting Standards In August 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , which simplifies accounting for convertible instruments by removing major separation models required under current GAAP. The ASU also removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and simplifies the diluted earnings per share calculation in certain areas. The amendments in this ASU are effective for annual and interim periods beginning after December 15, 2021, 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 November 2020, the SEC issued Rule 33-10890, “Management’s Discussion and Analysis, Selected Financial Data, and Supplementary Financial Information” to modernize, simplify, and enhance certain financial disclosure requirements in Regulation S-K. The amendment enhances and clarifies the disclosure requirements for liquidity and capital resources, eliminates the requirement to present five years of Selected Financial Data, amends the requirement to present two years of tabular selected quarterly financial data so that registrants only need to disclose when there are material retrospective changes and eliminates the tabular disclosure of contractual obligations. The final rules were effective on February 20, 2021 and registrants are required to apply the amended rules for the first fiscal year ending on or after August 9, 2021. The Company is in the process of evaluating the impact of this amendment on its related disclosures.

Earnings per Common Share

Earnings per Common Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings per Common Share	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 (restricted share awards, restricted stock units and performance stock units), each using the treasury stock method. Because we expect to settle the principal amount of the outstanding 2.0% convertible senior notes due 2023 ("2023 Convertible Notes") in cash, we use the treasury stock method for calculating the potential dilutive effect of the conversion feature on earnings per common share, if applicable. The conversion feature had a dilutive impact on earnings per common share for the three and six months ended June 30, 2021 and 2020, as the average market price per share of our common stock for the periods exceeded the conversion price of $101.38 per share. See Note 8, "Debt" for additional information about the 2023 Convertible Notes. Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Numerator — basic and diluted Net income $ 62,782 $ 48,174 $ 127,278 $ 104,921 Denominator Weighted average number of common shares outstanding — basic 33,458 36,169 33,470 36,292 Effect of dilutive restricted shares 668 732 714 806 Effect of dilutive stock options 376 444 373 453 Effect of dilutive convertible notes 872 507 661 470 Weighted average number of common shares outstanding — diluted 35,374 37,852 35,218 38,021 Earnings per common share — basic $ 1.88 $ 1.33 $ 3.80 $ 2.89 Earnings per common share — diluted $ 1.77 $ 1.27 $ 3.61 $ 2.76 Antidilutive stock options and restricted shares 2 54 5 33

Revenues

Revenues	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Revenues	Revenues We generate the majority of our revenues by providing consulting services to our clients. Most of our consulting service contracts are based on one of the following types of contract 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 contract 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). • Fixed-fee arrangements require the client to pay a fixed fee in exchange for a predetermined set of professional services. We recognize revenues earned to date by applying the proportional performance method. Generally, these arrangements have one performance obligation. • Performance-based or contingent arrangements represent forms of variable consideration. In these arrangements, our fees are based on the attainment of contractually defined objectives with our client, such as completing a business transaction or assisting the client in achieving a specific business objective. We recognize revenues earned to date in an amount that is probable not to reverse and by applying the proportional performance method when the criteria for over time revenue recognition are met. Certain fees in our time and materials arrangements may be subject to approval by a third-party, such as a bankruptcy court and other regulatory agency. In such cases, we record revenues based on the amount we estimate we will be entitled to in exchange for our services and only to the extent a significant reversal of revenue is not likely to occur when the uncertainty associated with the estimate is subsequently resolved. Potential fee reductions imposed by bankruptcy courts and other regulatory agencies or negotiated with specific clients are estimated on a specific identification basis. Our estimates may vary depending on the nature of the engagement, client economics, historical experience and other appropriate factors. When there are changes in our estimates of potential fee reductions, we record such changes to revenues with a corresponding offset to our billed and unbilled accounts receivable. Revenues recognized during the current period may include revenues from performance obligations satisfied or partially satisfied in previous periods. This primarily occurs when the estimated transaction price has changed based on our current probability assessment over whether the agreed-upon outcome for our performance-based and contingent arrangements will be achieved. The aggregate amount of revenues recognized related to a change in the transaction price in the current period, which related to performance obligations satisfied or partially satisfied in a prior period, was $17.9 million and $16.7 million for the three and six months ended June 30, 2021, respectively, and $8.3 million and $14.1 million for the three and six months ended June 30, 2020, respectively. Unfulfilled performance obligations primarily consist of fees not yet recognized on certain fixed-fee arrangements and performance-based and contingent arrangements. As of June 30, 2021 and December 31, 2020, the aggregate amount of the remaining contract transaction price allocated to unfulfilled performance obligations was $4.4 million and $8.5 million, respectively. 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 revenues but are not yet entitled to receive our fees because certain events, such as completion of the measurement period or client approval, must occur. The contract asset balance was $1.4 million as of June 30, 2021 and $2.6 million as of December 31, 2020.

Accounts Receivable and Allowan

Accounts Receivable and Allowance for Expected Credit Losses	6 Months Ended
	Jun. 30, 2021
Allowance for Doubtful Accounts and Unbilled Services [Abstract]
Accounts Receivable and Allowance for Expected Credit Losses	Accounts Receivable and Allowance for Expected Credit Losses The following table summarizes the components of "Accounts receivable, net" as presented on the Condensed Consolidated Balance Sheets: June 30, December 31, 2020 Accounts receivable: Billed receivables $ 598,624 $ 513,459 Unbilled receivables 287,040 236,285 Allowance for expected credit losses (39,543) (38,387) Accounts receivable, net $ 846,121 $ 711,357 We maintain an allowance for expected credit losses, which represents the estimated aggregate amount of credit risk arising from the inability or unwillingness of specific clients to pay our fees or disputes that may affect our ability to fully collect our billed accounts receivable. We record our estimate of lifetime expected credit losses concurrently with the initial recognition of the underlying receivable. Accounts receivable, net of the allowance for expected credit losses, represents the amount we expect to collect. At each reporting date, we adjust the allowance for expected credit losses to reflect our current estimate. The following table summarizes the total provision for expected credit losses and write-offs: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Provision for expected credit losses (1) $ 3,404 $ 7,752 $ 8,236 $ 11,624 Write-offs $ 2,802 $ 7,459 $ 9,718 $ 13,525 (1) Adjustments to the allowance for expected credit losses are recorded to selling, general & administrative ("SG&A") expenses on the Condensed Consolidated Statements of Comprehensive Income.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill The table below summarizes the changes in the carrying amount of goodwill by reportable segment: Corporate Finance & Restructuring (1) Forensic and Litigation Consulting (1) Economic Consulting (1) Technology (1) Strategic Communications (2) Total Balance at December 31, 2020 $ 506,072 $ 233,374 $ 269,087 $ 96,821 $ 129,525 $ 1,234,879 Acquisitions — 5,493 — — — 5,493 Foreign currency translation adjustment and other (1,560) 315 38 30 862 (315) Balance at June 30, 2021 $ 504,512 $ 239,182 $ 269,125 $ 96,851 $ 130,387 $ 1,240,057 (1) There were no accumulated impairment losses for the Corporate Finance & Restructuring ("Corporate Finance"), Forensic and Litigation Consulting ("FLC"), Economic Consulting or Technology segments as of June 30, 2021 and December 31, 2020, respectively. (2) Amounts for our Strategic Communications segment include gross carrying values of $324.5 million and $323.7 million as of June 30, 2021 and December 31, 2020, respectively, and accumulated impairment losses of $194.1 million as of June 30, 2021 and December 31, 2020. During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm that were assigned to the FLC segment. We recorded $5.5 million in goodwill based on a preliminary purchase price allocation as a result of the acquisition. We have included the results of the acquired business’s operations in the FLC segment since its acquisition date. Intangible Assets Intangible assets were as follows: June 30, 2021 December 31, 2020 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets Customer relationships (1) $ 113,937 $ 89,837 $ 24,100 $ 111,556 $ 85,180 $ 26,376 Trademarks 11,476 3,814 7,662 11,809 2,768 9,041 Acquired software and other 3,507 2,716 791 3,618 2,585 1,033 128,920 96,367 32,553 126,983 90,533 36,450 Non-amortizing intangible assets Trademarks 5,100 — 5,100 5,100 — 5,100 Total $ 134,020 $ 96,367 $ 37,653 $ 132,083 $ 90,533 $ 41,550 (1) During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm, and its related intangible assets were assigned to the FLC segment. Intangible assets with finite lives are amortized over their estimated useful lives. We recorded amortization expense of $2.9 million and $5.7 million for the three and six months ended June 30, 2021, respectively, and $2.3 million and $4.6 million for the three and six months ended June 30, 2020, respectively. We estimate our future amortization expense for our intangible assets with finite lives to be as follows: Year As of June 30, 2021 (1) 2021 (remaining) $ 5,207 2022 8,887 2023 5,192 2024 3,745 2025 3,051 Thereafter 6,471 $ 32,553 (1) Actual amortization expense to be reported in future periods could differ from these estimates because of new intangible asset acquisitions, impairments, changes in useful lives, or other relevant factors or changes.

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Financial Instruments	Financial Instruments The table below presents the carrying amounts and estimated fair values of our financial instruments by hierarchy level as of June 30, 2021 and December 31, 2020: June 30, 2021 Hierarchy Level Carrying Level 1 Level 2 Level 3 Liabilities Acquisition-related contingent consideration, including current portion (1)(2) $ 14,611 $ — $ — $ 14,611 2023 Convertible Notes (3) 291,581 — 446,725 — Total $ 306,192 $ — $ 446,725 $ 14,611 December 31, 2020 Hierarchy Level Carrying Level 1 Level 2 Level 3 Liabilities Acquisition-related contingent consideration, including current portion (1) $ 20,118 $ — $ — $ 20,118 2023 Convertible Notes (3) 286,131 — 396,982 — Total $ 306,249 $ — $ 396,982 $ 20,118 (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 Condensed Consolidated Balance Sheets. (2) During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm that were assigned to the FLC segment and recorded an acquisition-related contingent consideration liability. (3) The carrying values include unamortized deferred debt issue costs and debt discount. The fair values of financial instruments not included in the tables above are estimated to be equal to their carrying values as of June 30, 2021 and December 31, 2020. We estimate the fair value of our 2023 Convertible Notes based on their last actively traded prices. The fair value of our 2023 Convertible Notes is classified within Level 2 of the fair value hierarchy because it is traded in less active markets. We estimate the fair value of acquisition-related contingent consideration using either a probability-weighted discounted cash flow model or a Monte Carlo simulation. These fair value estimates represent Level 3 measurements as they are based on significant inputs not observed in the market and reflect our own assumptions. Significant increases (or decreases) in these unobservable inputs in isolation would result in significantly lower (or higher) fair values. We reassess the fair value of our acquisition-related contingent consideration at each reporting period based on additional information as it becomes available. The table below presents the change in our liability for acquisition-related contingent consideration for our Level 3 financial instruments: Contingent Consideration Balance at December 31, 2020 $ 20,118 Accretion expense (1) 1,289 Payments (1,000) Foreign currency translation adjustment (2) (612) Balance at March 31, 2021 $ 19,795 Additions (3) 1,093 Accretion expense (1) 676 Payments (4,122) Foreign currency translation adjustment (2) 264 Remeasurement gain (4) (3,095) Balance at June 30, 2021 $ 14,611 Contingent Consideration Balance at December 31, 2019 $ 14,826 Accretion expense (1) 506 Foreign currency translation adjustment (2) (148) Balance at March 31, 2020 $ 15,184 Accretion expense (1) 614 Payments (4,692) Foreign currency translation adjustment (2) 88 Balance at June 30, 2020 $ 11,194 (1) Accretion expense is included in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income. (2) Foreign currency translation adjustments are included in "Other comprehensive income (loss), net of tax" on the Condensed Consolidated Statements of Comprehensive Income. (3) During the three months ended June 30, 2021, we acquired certain assets of a business that were assigned to the FLC segment and recorded an acquisition-related contingent consideration liability. (4) Remeasurement gain or loss resulting from a change in the fair value of an acquisition's contingent consideration liability is recorded in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income.

Debt

Debt	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Debt	Debt The table below presents the components of the Company’s debt: June 30, December 31, 2020 2023 Convertible Notes $ 316,250 $ 316,250 Credit Facility 100,000 — Total debt 416,250 316,250 Less: deferred debt discount (21,582) (26,310) Less: deferred debt issue costs (3,087) (3,809) Long-term debt, net (1) $ 391,581 $ 286,131 Additional paid-in capital $ 35,306 $ 35,306 Discount attribution to equity (1,175) (1,175) Equity component, net $ 34,131 $ 34,131 (1) There were no current portions of long-term debt as of June 30, 2021 and December 31, 2020. 2023 Convertible Notes On August 20, 2018, we issued the 2023 Convertible Notes in an aggregate principal amount of $316.3 million. The 2023 Convertible Notes bear interest at a fixed rate of 2.0% per year, payable semiannually in arrears on February 15th and August 15th of each year and will mature on August 15, 2023, unless earlier converted or repurchased. The 2023 Convertible Notes are senior unsecured obligations of the Company. The 2023 Convertible Notes are convertible at maturity at a conversion rate of 9.8643 shares of our common stock per $1,000 principal amount of the 2023 Convertible Notes (equivalent to a conversion price of approximately $101.38 per share of common stock). Subject to the conditions set forth in the indenture governing the 2023 Convertible Notes, 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 circumstances required to allow the holders to convert their 2023 Convertible Notes prior to maturity were met as of June 30, 2021, therefore, holders may convert their notes at any time beginning on July 1, 2021 and ending on September 30, 2021. We continue to classify the net carrying amount of the 2023 Convertible Notes as long-term debt based on our intent and ability to refinance the principal portion of our debt on a long-term basis. The excess of the principal amount of the liability 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 incurred debt issue costs and allocated the total amount to the liability and equity components of the 2023 Convertible Notes based on their relative values. The debt issue costs attributable to the liability component are amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method. Issuance costs attributable to the equity component were netted with the equity component in stockholders' equity. The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Contractual interest expense $ 1,581 $ 1,581 $ 3,162 $ 3,162 Amortization of debt discount (1) 2,380 2,255 4,728 4,480 Total $ 3,961 $ 3,836 $ 7,890 $ 7,642 (1) The effective interest rate of the liability component is 5.45%. Credit Facility On June 26, 2015, we entered into a credit agreement, which provides for a $550.0 million senior secured bank revolving credit facility (“Original Credit Facility”) maturing on June 26, 2020. In November 2018, we amended and restated the credit agreement to the Original Credit Facility, to, among other things, extend the maturity to November 30, 2023 and incurred an additional $1.7 million of debt issuance costs (the Original Credit Facility as amended and restated, the “Credit Facility”). The Company classified the borrowings under the Company’s Credit Facility as long-term debt in the accompanying Condensed Consolidated Balance Sheets, as amounts due under the Credit Facility are not contractually required or expected to be liquidated for more than one year from the applicable balance sheet date. As of June 30, 2021, $1.1 million of the borrowing limit under the Credit Facility was utilized (and, therefore, unavailable) for letters of credit. There were $1.1 million and $1.3 million of unamortized debt issue costs related to the Credit Facility as of June 30, 2021 and December 31, 2020, respectively. These amounts are included in “Other assets” on our Condensed Consolidated Balance Sheets.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	Leases We lease office space and equipment under non-cancelable operating leases. We recognize operating lease expense on a straight-line basis over the lease term, which may include renewal or termination options that are reasonably certain of exercise. Leases with an initial term of 12 months or less are not recorded on the balance sheet and are expensed on a straight-line basis. Most leases include one or more options to renew, with renewal terms that can extend the lease term from six months to seven years. The exercise of lease renewal options is at our sole discretion. Certain of our lease agreements include rental payments that are adjusted periodically for inflation. Our lease agreements do not contain any material residual value guar antees or material restrictive covenants. The current period disclosures below reflect our new principal office space in New York, New York, as we accepted possession of the premises on April 1, 2021. The table below summarizes the carrying amount of our operating lease assets and liabilities: Leases Classification June 30, 2021 December 31, 2020 Assets Operating lease assets Operating lease assets $ 223,618 $ 156,645 Total lease assets $ 223,618 $ 156,645 Liabilities Current Operating lease liabilities Accounts payable, accrued expenses and other $ 35,214 $ 42,716 Noncurrent Operating lease liabilities Noncurrent operating lease liabilities 230,133 161,677 Total lease liabilities $ 265,347 $ 204,393 The table below summarizes total lease costs: Three Months Ended June 30, Six Months Ended June 30, Lease Cost 2021 2020 2021 2020 Operating lease costs $ 14,407 $ 11,800 $ 26,489 $ 23,599 Short-term lease costs 473 487 962 1,009 Variable lease costs 2,748 2,846 6,211 5,832 Sublease income (1,048) (1,041) (2,095) (2,130) Total lease cost, net $ 16,580 $ 14,092 $ 31,567 $ 28,310 We sublease certain of our leased office spaces to third parties. Our sublease portfolio consists of leases of office space that we have vacated before the lease term expiration. Operating lease expense on vacated office space is reduced by sublease rental income, which is recorded to SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income. Our sublease arrangements do not contain renewal options or restrictive covenants. We estimate future sublease rental income to be $2.1 million in the remainder of 2021, $0.8 million in 2022, $0.6 million in 2023, $0.6 million in 2024 and $0.3 million in 2025. There is no future sublease rental income estimated for the years beyond 2025. The maturity analysis below summarizes the remaining future undiscounted cash flows for our operating leases and includes a reconciliation to operating lease liabilities reported on the Condensed Consolidated Balance Sheets: As of 2021 (remaining) $ 5,623 2022 49,443 2023 45,999 2024 40,781 2025 34,871 Thereafter 172,048 Total future lease payments 348,765 Less: imputed interest (83,418) Total $ 265,347 The table below includes cash paid for our operating lease liabilities, other non-cash information, our weighted average remaining lease term and weighted average discount rate: Six Months Ended June 30, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 31,050 $ 26,986 Operating lease assets obtained in exchange for lease liabilities $ 85,221 $ 11,954 Weighted average remaining lease term (years) Operating leases 8.8 6.3 Weighted average discount rate Operating leases 5.5 % 5.5 %

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and ContingenciesWe are subject to legal actions arising in the ordinary course of business. In management’s opinion, we believe we have adequate legal defenses and/or insurance coverage with respect to the eventuality of such actions. We do not believe any settlement or judgment relating to any pending legal action would materially affect our financial position or results of operations.

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation During the six months ended June 30, 2021, we granted 87,787 restricted share awards, 35,226 restricted stock units and 103,220 performance stock units under the FTI Consulting, Inc. 2017 Omnibus Incentive Compensation Plan, our employee equity compensation plan. Our performance stock units are presented at the maximum potential payout percentage of 150% of target shares granted. These awards are recorded as equity on the Condensed Consolidated Balance Sheets. During the six months ended June 30, 2021, 7,943 shares of restricted stock and no stock options were forfeited prior to the completion of the applicable vesting requirements. Additionally, 27,221 performance stock units were forfeited during the six months ended June 30, 2021. Total share-based compensation expense, net of forfeitures is detailed in the following table: Three Months Ended June 30, Six Months Ended June 30, Income Statement Classification 2021 2020 2021 2020 Direct cost of revenues $ 2,666 $ 2,141 $ 7,731 $ 7,864 Selling, general and administrative expenses 2,409 2,725 6,932 5,936 Total share-based compensation expense $ 5,075 $ 4,866 $ 14,663 $ 13,800

Stockholders' Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity On June 2, 2016, our Board of Directors authorized a stock repurchase program of up to $100.0 million (the “Repurchase Program”). On each of May 18, 2017, December 1, 2017, February 21, 2019 and February 20, 2020, our Board of Directors authorized an additional $100.0 million, respectively. On each of July 28, 2020 and December 3, 2020, our Board of Directors authorized an additional $200.0 million, respectively, increasing the Repurchase Program to an aggregate authorization of $900.0 million. No time limit has been established for the completion of the Repurchase Program, and the Repurchase Program may be suspended, discontinued or replaced by the Board of Directors at any time without prior notice. As of June 30, 2021, we have $167.1 million available under the Repurchase Program to repurchase additional shares. The following table details our stock repurchases under the Repurchase Program: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Shares of common stock repurchased and retired — 471 422 921 Average price paid per share $ — $ 108.41 $ 109.37 $ 110.03 Total cost $ — $ 51,043 $ 46,124 $ 101,344 As we repurchase our common shares, we reduce stated capital on our Condensed Consolidated Balance Sheets for the $0.01 of par value of the shares repurchased, with the excess purchase price over par value recorded as a reduction to additional paid-in capital. If additional paid-in capital is reduced to zero, we record the remainder of the excess purchase price over par value as a reduction of retained earnings. During the six months ended June 30, 2021, due to the volume of repurchases, we recorded a reduction to stated capital for the par value of the shares repurchased, with a portion of the excess purchase price over par value recorded as a reduction to additional paid-in capital of $3.0 million and the remainder of the excess purchase price over par value of $43.1 million recorded as a reduction of retained earnings. Common stock outstanding was 34.3 million shares and 34.5 million shares as of June 30, 2021 and December 31, 2020, respectively. Common stock outstanding includes unvested restricted stock awards, which are considered issued and outstanding under the terms of the restricted stock award agreements.

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting We manage our business in five reportable segments: Corporate Finance, FLC, Economic Consulting, Technology and Strategic Communications. Our Corporate Finance segment focuses on the strategic, operational, financial, transactional and capital needs of our clients around the world. Our clients include companies, boards of directors, investors, private equity sponsors, banks, lenders, and other financing sources and creditor groups, as well as other parties-in-interest. We deliver a wide range of services centered around three core offerings: business transformation, transactions and turnaround, restructuring and bankruptcy. Our FLC segment provides law firms, companies, government entities and other interested parties with a multidisciplinary and independent range of services in risk and investigations and disputes, including a focus on highly regulated industries such as our construction & environmental solutions and health solutions services. These services are supported by our data & analytics services which help our clients analyze large, disparate sets of data related to their business operations and support our clients during regulatory inquiries and commercial disputes. We deliver a wide range of services centered around five core offerings: construction & environmental solutions, data & analytics, disputes, health solutions and risk and investigations. Our Economic Consulting segment, including subsidiary Compass Lexecon LLC, provides law firms, companies, government entities and other interested parties with analyses of complex economic issues for use in international arbitration, legal and regulatory proceedings, and strategic decision making and public policy debates around the world. We deliver a wide range of services centered around three core offerings: antitrust & competition economics, financial economics and international arbitration. Our Technology segment provides companies, law firms and government entities with a comprehensive global portfolio of e-discovery, information governance, privacy and security and corporate legal operations solutions. We deliver a full spectrum of services including data collection, data processing, document review, hosting, advanced analytics and consulting to help clients secure, govern, analyze and understand their data in the context of compliance and risk. Our Strategic Communications segment develops and executes communications strategies to help management teams, boards of directors, law firms, governments and regulators manage change and mitigate risk surrounding transformational and disruptive events, including transactions, investigations, disputes, crises, regulation and legislation. We deliver a wide range of services centered around three core offerings: corporate reputation, financial communications and public affairs. 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, which is 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 as a basis 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: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenues Corporate Finance $ 230,971 $ 246,011 $ 457,174 $ 453,760 FLC 150,746 106,381 301,567 253,978 Economic Consulting 183,306 151,493 352,579 283,631 Technology 78,646 47,084 158,105 105,807 Strategic Communications 67,817 56,883 128,338 115,269 Total revenues $ 711,486 $ 607,852 $ 1,397,763 $ 1,212,445 Adjusted Segment EBITDA Corporate Finance $ 40,174 $ 76,264 $ 77,613 $ 125,210 FLC 18,002 (9,047) 47,434 12,161 Economic Consulting 30,699 21,694 57,278 34,404 Technology 18,518 6,435 40,116 20,919 Strategic Communications 13,501 10,034 23,899 18,810 Total Adjusted Segment EBITDA $ 120,894 $ 105,380 $ 246,340 $ 211,504 The table below reconciles net income to Total Adjusted Segment EBITDA: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net income $ 62,782 $ 48,174 $ 127,278 $ 104,921 Add back: Income tax provision 14,992 14,470 35,239 30,935 Interest income and other 912 (2,202) (122) (7,219) Interest expense 5,294 5,157 10,091 10,018 Unallocated corporate expenses 29,357 30,276 56,067 53,867 Segment depreciation expense 7,834 7,191 15,264 14,337 Amortization of intangible assets 2,853 2,314 5,653 4,645 Remeasurement of acquisition-related contingent consideration (3,130) — (3,130) — Total Adjusted Segment EBITDA $ 120,894 $ 105,380 $ 246,340 $ 211,504

New Accounting Standards (Polic

New Accounting Standards (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Changes and Error Corrections [Abstract]
Basis of Presentation	The unaudited condensed consolidated financial statements of FTI Consulting, Inc., including its consolidated subsidiaries (collectively, the “Company,” “we,” “our” or “FTI Consulting”), presented herein, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and under the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial information. Some of the information and footnote disclosures normally included in annual financial statements have been condensed or omitted pursuant to those rules and regulations. Certain prior period amounts have been reclassified to conform to the current period presentation. In management’s opinion, the interim financial statements reflect all adjustments that are necessary for a fair presentation of the results for the interim periods presented. All adjustments made were normal recurring accruals. Results of operations for the interim periods presented herein are not necessarily indicative of results of operations for a full year. These financial statements should be read in conjunction with the consolidated financial statements and the notes thereto contained in our Annual Report on Form 10-K for the year ended December 31, 2020 filed with the SEC.
Recently Adopted Accounting Standards and Accounting Standards Not Yet Adopted	In August 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity , which simplifies accounting for convertible instruments by removing major separation models required under current GAAP. The ASU also removes certain settlement conditions that are required for equity contracts to qualify for the derivative scope exception and simplifies the diluted earnings per share calculation in certain areas. The amendments in this ASU are effective for annual and interim periods beginning after December 15, 2021, 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 November 2020, the SEC issued Rule 33-10890, “Management’s Discussion and Analysis, Selected Financial Data, and Supplementary Financial Information” to modernize, simplify, and enhance certain financial disclosure requirements in Regulation S-K. The amendment enhances and clarifies the disclosure requirements for liquidity and capital resources, eliminates the requirement to present five years of Selected Financial Data, amends the requirement to present two years of tabular selected quarterly financial data so that registrants only need to disclose when there are material retrospective changes and eliminates the tabular disclosure of contractual obligations. The final rules were effective on February 20, 2021 and registrants are required to apply the amended rules for the first fiscal year ending on or after August 9, 2021. The Company is in the process of evaluating the impact of this amendment on its related disclosures.

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share Basic and Diluted	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Numerator — basic and diluted Net income $ 62,782 $ 48,174 $ 127,278 $ 104,921 Denominator Weighted average number of common shares outstanding — basic 33,458 36,169 33,470 36,292 Effect of dilutive restricted shares 668 732 714 806 Effect of dilutive stock options 376 444 373 453 Effect of dilutive convertible notes 872 507 661 470 Weighted average number of common shares outstanding — diluted 35,374 37,852 35,218 38,021 Earnings per common share — basic $ 1.88 $ 1.33 $ 3.80 $ 2.89 Earnings per common share — diluted $ 1.77 $ 1.27 $ 3.61 $ 2.76 Antidilutive stock options and restricted shares 2 54 5 33

Accounts Receivable and Allow_2

Accounts Receivable and Allowance for Expected Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2021
Allowance for Doubtful Accounts and Unbilled Services [Abstract]
Schedule of Accounts Receivable	The following table summarizes the components of "Accounts receivable, net" as presented on the Condensed Consolidated Balance Sheets: June 30, December 31, 2020 Accounts receivable: Billed receivables $ 598,624 $ 513,459 Unbilled receivables 287,040 236,285 Allowance for expected credit losses (39,543) (38,387) Accounts receivable, net $ 846,121 $ 711,357
Schedule of Accounts Receivable, Writeoff	The following table summarizes the total provision for expected credit losses and write-offs: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Provision for expected credit losses (1) $ 3,404 $ 7,752 $ 8,236 $ 11,624 Write-offs $ 2,802 $ 7,459 $ 9,718 $ 13,525

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2021
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 (1) Forensic and Litigation Consulting (1) Economic Consulting (1) Technology (1) Strategic Communications (2) Total Balance at December 31, 2020 $ 506,072 $ 233,374 $ 269,087 $ 96,821 $ 129,525 $ 1,234,879 Acquisitions — 5,493 — — — 5,493 Foreign currency translation adjustment and other (1,560) 315 38 30 862 (315) Balance at June 30, 2021 $ 504,512 $ 239,182 $ 269,125 $ 96,851 $ 130,387 $ 1,240,057 (1) There were no accumulated impairment losses for the Corporate Finance & Restructuring ("Corporate Finance"), Forensic and Litigation Consulting ("FLC"), Economic Consulting or Technology segments as of June 30, 2021 and December 31, 2020, respectively. (2) Amounts for our Strategic Communications segment include gross carrying values of $324.5 million and $323.7 million as of June 30, 2021 and December 31, 2020, respectively, and accumulated impairment losses of $194.1 million as of June 30, 2021 and December 31, 2020.
Schedule of Other Intangible Assets Amortized Intangibles	Intangible assets were as follows: June 30, 2021 December 31, 2020 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets Customer relationships (1) $ 113,937 $ 89,837 $ 24,100 $ 111,556 $ 85,180 $ 26,376 Trademarks 11,476 3,814 7,662 11,809 2,768 9,041 Acquired software and other 3,507 2,716 791 3,618 2,585 1,033 128,920 96,367 32,553 126,983 90,533 36,450 Non-amortizing intangible assets Trademarks 5,100 — 5,100 5,100 — 5,100 Total $ 134,020 $ 96,367 $ 37,653 $ 132,083 $ 90,533 $ 41,550 (1) During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm, and its related intangible assets were assigned to the FLC segment.
Schedule of Other Intangible Assets Unamortized Intangibles	Intangible assets were as follows: June 30, 2021 December 31, 2020 Gross Accumulated Net Gross Accumulated Net Amortizing intangible assets Customer relationships (1) $ 113,937 $ 89,837 $ 24,100 $ 111,556 $ 85,180 $ 26,376 Trademarks 11,476 3,814 7,662 11,809 2,768 9,041 Acquired software and other 3,507 2,716 791 3,618 2,585 1,033 128,920 96,367 32,553 126,983 90,533 36,450 Non-amortizing intangible assets Trademarks 5,100 — 5,100 5,100 — 5,100 Total $ 134,020 $ 96,367 $ 37,653 $ 132,083 $ 90,533 $ 41,550 (1) During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm, and its related intangible assets were assigned to the FLC segment.
Schedule of Future Amortization Expense Intangible Assets	We estimate our future amortization expense for our intangible assets with finite lives to be as follows: Year As of June 30, 2021 (1) 2021 (remaining) $ 5,207 2022 8,887 2023 5,192 2024 3,745 2025 3,051 Thereafter 6,471 $ 32,553 (1) Actual amortization expense to be reported in future periods could differ from these estimates because of new intangible asset acquisitions, impairments, changes in useful lives, or other relevant factors or changes.

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of Carrying and Estimated Fair Value of Other Financial Instruments	The table below presents the carrying amounts and estimated fair values of our financial instruments by hierarchy level as of June 30, 2021 and December 31, 2020: June 30, 2021 Hierarchy Level Carrying Level 1 Level 2 Level 3 Liabilities Acquisition-related contingent consideration, including current portion (1)(2) $ 14,611 $ — $ — $ 14,611 2023 Convertible Notes (3) 291,581 — 446,725 — Total $ 306,192 $ — $ 446,725 $ 14,611 December 31, 2020 Hierarchy Level Carrying Level 1 Level 2 Level 3 Liabilities Acquisition-related contingent consideration, including current portion (1) $ 20,118 $ — $ — $ 20,118 2023 Convertible Notes (3) 286,131 — 396,982 — Total $ 306,249 $ — $ 396,982 $ 20,118 (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 Condensed Consolidated Balance Sheets. (2) During the three months ended June 30, 2021, we acquired certain assets of a leading construction consulting firm that were assigned to the FLC segment and recorded an acquisition-related contingent consideration liability. (3) The carrying values include unamortized deferred debt issue costs and debt discount.
Schedule of Acquisition-Related Contingent Consideration	The table below presents the change in our liability for acquisition-related contingent consideration for our Level 3 financial instruments: Contingent Consideration Balance at December 31, 2020 $ 20,118 Accretion expense (1) 1,289 Payments (1,000) Foreign currency translation adjustment (2) (612) Balance at March 31, 2021 $ 19,795 Additions (3) 1,093 Accretion expense (1) 676 Payments (4,122) Foreign currency translation adjustment (2) 264 Remeasurement gain (4) (3,095) Balance at June 30, 2021 $ 14,611 Contingent Consideration Balance at December 31, 2019 $ 14,826 Accretion expense (1) 506 Foreign currency translation adjustment (2) (148) Balance at March 31, 2020 $ 15,184 Accretion expense (1) 614 Payments (4,692) Foreign currency translation adjustment (2) 88 Balance at June 30, 2020 $ 11,194 (1) Accretion expense is included in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income. (2) Foreign currency translation adjustments are included in "Other comprehensive income (loss), net of tax" on the Condensed Consolidated Statements of Comprehensive Income. (3) During the three months ended June 30, 2021, we acquired certain assets of a business that were assigned to the FLC segment and recorded an acquisition-related contingent consideration liability. (4) Remeasurement gain or loss resulting from a change in the fair value of an acquisition's contingent consideration liability is recorded in SG&A expenses on the Condensed Consolidated Statements of Comprehensive Income.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Summary of Components of Debt Obligations	The table below presents the components of the Company’s debt: June 30, December 31, 2020 2023 Convertible Notes $ 316,250 $ 316,250 Credit Facility 100,000 — Total debt 416,250 316,250 Less: deferred debt discount (21,582) (26,310) Less: deferred debt issue costs (3,087) (3,809) Long-term debt, net (1) $ 391,581 $ 286,131 Additional paid-in capital $ 35,306 $ 35,306 Discount attribution to equity (1,175) (1,175) Equity component, net $ 34,131 $ 34,131 (1) There were no current portions of long-term debt as of June 30, 2021 and December 31, 2020.
Summary of Interest Expense	The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Contractual interest expense $ 1,581 $ 1,581 $ 3,162 $ 3,162 Amortization of debt discount (1) 2,380 2,255 4,728 4,480 Total $ 3,961 $ 3,836 $ 7,890 $ 7,642 (1) The effective interest rate of the liability component is 5.45%.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Schedule of Carrying Amount of Operating Lease Assets and Liabilities	The table below summarizes the carrying amount of our operating lease assets and liabilities: Leases Classification June 30, 2021 December 31, 2020 Assets Operating lease assets Operating lease assets $ 223,618 $ 156,645 Total lease assets $ 223,618 $ 156,645 Liabilities Current Operating lease liabilities Accounts payable, accrued expenses and other $ 35,214 $ 42,716 Noncurrent Operating lease liabilities Noncurrent operating lease liabilities 230,133 161,677 Total lease liabilities $ 265,347 $ 204,393
Schedule of Lease Cost	The table below summarizes total lease costs: Three Months Ended June 30, Six Months Ended June 30, Lease Cost 2021 2020 2021 2020 Operating lease costs $ 14,407 $ 11,800 $ 26,489 $ 23,599 Short-term lease costs 473 487 962 1,009 Variable lease costs 2,748 2,846 6,211 5,832 Sublease income (1,048) (1,041) (2,095) (2,130) Total lease cost, net $ 16,580 $ 14,092 $ 31,567 $ 28,310 The table below includes cash paid for our operating lease liabilities, other non-cash information, our weighted average remaining lease term and weighted average discount rate: Six Months Ended June 30, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 31,050 $ 26,986 Operating lease assets obtained in exchange for lease liabilities $ 85,221 $ 11,954 Weighted average remaining lease term (years) Operating leases 8.8 6.3 Weighted average discount rate Operating leases 5.5 % 5.5 %
Schedule of Future Minimum Lease Payments	The maturity analysis below summarizes the remaining future undiscounted cash flows for our operating leases and includes a reconciliation to operating lease liabilities reported on the Condensed Consolidated Balance Sheets: As of 2021 (remaining) $ 5,623 2022 49,443 2023 45,999 2024 40,781 2025 34,871 Thereafter 172,048 Total future lease payments 348,765 Less: imputed interest (83,418) Total $ 265,347

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation Expense	Total share-based compensation expense, net of forfeitures is detailed in the following table: Three Months Ended June 30, Six Months Ended June 30, Income Statement Classification 2021 2020 2021 2020 Direct cost of revenues $ 2,666 $ 2,141 $ 7,731 $ 7,864 Selling, general and administrative expenses 2,409 2,725 6,932 5,936 Total share-based compensation expense $ 5,075 $ 4,866 $ 14,663 $ 13,800

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Schedule of Stock Repurchases	The following table details our stock repurchases under the Repurchase Program: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Shares of common stock repurchased and retired — 471 422 921 Average price paid per share $ — $ 108.41 $ 109.37 $ 110.03 Total cost $ — $ 51,043 $ 46,124 $ 101,344

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
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: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Revenues Corporate Finance $ 230,971 $ 246,011 $ 457,174 $ 453,760 FLC 150,746 106,381 301,567 253,978 Economic Consulting 183,306 151,493 352,579 283,631 Technology 78,646 47,084 158,105 105,807 Strategic Communications 67,817 56,883 128,338 115,269 Total revenues $ 711,486 $ 607,852 $ 1,397,763 $ 1,212,445 Adjusted Segment EBITDA Corporate Finance $ 40,174 $ 76,264 $ 77,613 $ 125,210 FLC 18,002 (9,047) 47,434 12,161 Economic Consulting 30,699 21,694 57,278 34,404 Technology 18,518 6,435 40,116 20,919 Strategic Communications 13,501 10,034 23,899 18,810 Total Adjusted Segment EBITDA $ 120,894 $ 105,380 $ 246,340 $ 211,504
Reconciliation of Net Income to Adjusted Segment Earnings Before Interest, Taxes, Depreciation and Amortization	The table below reconciles net income to Total Adjusted Segment EBITDA: Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Net income $ 62,782 $ 48,174 $ 127,278 $ 104,921 Add back: Income tax provision 14,992 14,470 35,239 30,935 Interest income and other 912 (2,202) (122) (7,219) Interest expense 5,294 5,157 10,091 10,018 Unallocated corporate expenses 29,357 30,276 56,067 53,867 Segment depreciation expense 7,834 7,191 15,264 14,337 Amortization of intangible assets 2,853 2,314 5,653 4,645 Remeasurement of acquisition-related contingent consideration (3,130) — (3,130) — Total Adjusted Segment EBITDA $ 120,894 $ 105,380 $ 246,340 $ 211,504

Earnings per Common Share (Deta

Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Aug. 20, 2018
Earnings Per Common Share [Line Items]
Conversion price (in dollars per share)	$ 101.38		$ 101.38		$ 101.38	$ 101.38
Numerator — basic and diluted
Net income	$ 62,782	$ 64,496	$ 48,174	$ 56,747	$ 127,278	$ 104,921
Denominator
Weighted average number of common shares outstanding — basic (in shares)	33,458		36,169		33,470	36,292
Effect of dilutive convertible shares (in shares)	668		732		714	806
Effect of dilutive stock options (in shares)	376		444		373	453
Effect of dilutive convertible notes (in shares)	872		507		661	470
Weighted average number of common shares outstanding — diluted (in shares)	35,374		37,852		35,218	38,021
Earnings per common share — basic (in dollars per share)	$ 1.88		$ 1.33		$ 3.80	$ 2.89
Earnings per common share — diluted (in dollars per share)	$ 1.77		$ 1.27		$ 3.61	$ 2.76
Stock Options and Restricted Shares
Denominator
Antidilutive stock options and restricted shares (in shares)	2		54		5	33
Senior Notes | 2023 Convertible Notes
Earnings Per Common Share [Line Items]
Interest rate (as a percent)	2.00%				2.00%		2.00%
Conversion price (in dollars per share)							$ 101.38

Revenues (Details)

Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations satisfied or partially satisfied in previous periods	$ 17,900	$ 8,300	$ 16,700	$ 14,100
Unfulfilled performance obligations					$ 8,500
Contract asset	1,400		1,400		2,600
Contract liability	0		0		$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unfulfilled performance obligations	$ 4,400		$ 4,400
Performance obligation expected duration	24 months		24 months

Accounts Receivable and Allow_3

Accounts Receivable and Allowance for Expected Credit Losses - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts receivable:
Billed receivables	$ 598,624	$ 513,459
Unbilled receivables	287,040	236,285
Allowance for expected credit losses	(39,543)	(38,387)
Accounts receivable, net	$ 846,121	$ 711,357

Accounts Receivable and Allow_4

Accounts Receivable and Allowance for Expected Credit Losses - Writeoff (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Allowance for Doubtful Accounts and Unbilled Services [Abstract]
Provision for expected credit losses	$ 3,404	$ 7,752	$ 8,236	$ 11,624
Write-offs	$ 2,802	$ 7,459	$ 9,718	$ 13,525

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill beginning of period		$ 1,234,879,000
Acquisitions		5,493,000
Foreign currency translation adjustment and other		(315,000)
Goodwill end of period	$ 1,240,057,000	1,240,057,000
Corporate Finance & Restructuring
Goodwill [Roll Forward]
Goodwill beginning of period		506,072,000
Acquisitions		0
Foreign currency translation adjustment and other		(1,560,000)
Goodwill end of period	504,512,000	504,512,000
Accumulated impairment loss	0	0	$ 0
Forensic and Litigation Consulting
Goodwill [Roll Forward]
Goodwill beginning of period		233,374,000
Acquisitions	5,500,000	5,493,000
Foreign currency translation adjustment and other		315,000
Goodwill end of period	239,182,000	239,182,000
Accumulated impairment loss	0	0	0
Economic Consulting
Goodwill [Roll Forward]
Goodwill beginning of period		269,087,000
Acquisitions		0
Foreign currency translation adjustment and other		38,000
Goodwill end of period	269,125,000	269,125,000
Accumulated impairment loss	0	0	0
Technology
Goodwill [Roll Forward]
Goodwill beginning of period		96,821,000
Acquisitions		0
Foreign currency translation adjustment and other		30,000
Goodwill end of period	96,851,000	96,851,000
Accumulated impairment loss	0	0	0
Strategic Communications
Goodwill [Roll Forward]
Goodwill beginning of period		129,525,000
Acquisitions		0
Foreign currency translation adjustment and other		862,000
Goodwill end of period	130,387,000	130,387,000
Accumulated impairment loss	194,100,000	194,100,000	194,100,000
Goodwill	$ 324,500,000	$ 324,500,000	$ 323,700,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 128,920	$ 126,983
Accumulated Amortization	96,367	90,533
Net Carrying Amount	32,553	36,450
Intangible assets, gross carrying amount	134,020	132,083
Intangible assets, Net Carrying Amount	37,653	41,550
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount, non-amortizing intangible assets	5,100	5,100
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	113,937	111,556
Accumulated Amortization	89,837	85,180
Net Carrying Amount	24,100	26,376
Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,476	11,809
Accumulated Amortization	3,814	2,768
Net Carrying Amount	7,662	9,041
Acquired software and other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,507	3,618
Accumulated Amortization	2,716	2,585
Net Carrying Amount	$ 791	$ 1,033

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill [Line Items]
Acquisitions			$ 5,493
Amortization of other intangible assets	$ 2,854	$ 2,314	5,655	$ 4,645
Forensic and Litigation Consulting
Goodwill [Line Items]
Acquisitions	$ 5,500		$ 5,493

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Future Amortization Expense (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
2021	$ 5,207
2022	8,887
2023	5,192
2024	3,745
2025	3,051
Thereafter	6,471
Net Carrying Amount	$ 32,553	$ 36,450

Financial Instruments - Carryin

Financial Instruments - Carrying And Estimated Fair Value Of Other Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	$ 14,611	$ 20,118
Long-term debt	291,581	286,131
Total	306,192	306,249
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	446,725	396,982
Total	446,725	396,982
Level 3 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	14,611	20,118
Long-term debt	0	0
Total	$ 14,611	$ 20,118

Financial Instruments - Fair Va

Financial Instruments - Fair Value Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 19,795	$ 20,118	$ 15,184	$ 14,826
Additions	1,093
Accretion expense	676	1,289	614	506
Payments	(4,122)	(1,000)	(4,692)
Foreign currency translation adjustment	264	(612)	88	(148)
Remeasurement gain	(3,095)
Ending balance	$ 14,611	$ 19,795	$ 11,194	$ 15,184

Debt - Summary of Components of

Debt - Summary of Components of Debt Obligations (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 416,250,000	$ 316,250,000
Less: deferred debt discount	(21,582,000)	(26,310,000)
Less: deferred debt issue costs	(3,087,000)	(3,809,000)
Long-term debt, net	391,581,000	286,131,000
Additional paid-in capital	35,306,000	35,306,000
Discount attribution to equity	(1,175,000)	(1,175,000)
Equity component, net	34,131,000	34,131,000
Current portion of long-term debt	0	0
2023 Convertible Notes
Debt Instrument [Line Items]
Total debt	316,250,000	316,250,000
Credit Facility
Debt Instrument [Line Items]
Total debt	$ 100,000,000	$ 0

Debt - Additional Information (

Debt - Additional Information (Details)	Aug. 20, 2018USD ($)$ / shares	Jun. 30, 2021USD ($)$ / shares	Dec. 31, 2020USD ($)	Jun. 30, 2020$ / shares	Nov. 30, 2018USD ($)	Jun. 26, 2015USD ($)
Debt Instrument [Line Items]
Principal amount		$ 416,250,000	$ 316,250,000
Conversion price (in dollars per share) | $ / shares		$ 101.38		$ 101.38
Unamortized debt issuance costs		$ 3,087,000	3,809,000
Line of Credit
Debt Instrument [Line Items]
Borrowing limit used		1,100,000
2023 Convertible Notes
Debt Instrument [Line Items]
Principal amount		$ 316,250,000	316,250,000
2023 Convertible Notes | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 316,300,000
Interest rate (as a percent)	2.00%	2.00%
Debt conversion ratio (in shares)	0.0098643
Conversion price (in dollars per share) | $ / shares	$ 101.38
Credit Facility
Debt Instrument [Line Items]
Principal amount		$ 100,000,000	0
Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 550,000,000
Debt issuance costs					$ 1,700,000
Unamortized debt issuance costs		$ 1,100,000	$ 1,300,000

Debt - Summary of Interest Expe

Debt - Summary of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Amortization of debt discount			$ 5,685	$ 6,000
Senior Notes | 2023 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,581	$ 1,581	3,162	3,162
Amortization of debt discount	2,380	2,255	4,728	4,480
Total	$ 3,961	$ 3,836	$ 7,890	$ 7,642
Effective interest rate (as a percent)	5.45%		5.45%

Leases - Additional Information

Leases - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)lease_option
Lessee, Lease, Description [Line Items]
Number of renewal options | lease_option	1
Sublease rental income Remainder of 2021	$ 2,100
Sublease rental income 2022	800
Sublease rental income 2023	600
Sublease rental income 2024	600
Sublease rental income 2025	300
Operating lease rental payments	$ 348,765
Minimum
Lessee, Lease, Description [Line Items]
Renewal term	6 months
Maximum
Lessee, Lease, Description [Line Items]
Renewal term	7 years

Leases - Lease Assets and Liabi

Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease assets	$ 223,618	$ 156,645
Current operating lease liabilities	35,214	42,716
Noncurrent operating lease liabilities	230,133	161,677
Total lease liabilities	$ 265,347	$ 204,393
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease Cost
Operating lease costs	$ 14,407	$ 11,800	$ 26,489	$ 23,599
Short-term lease costs	473	487	962	1,009
Variable lease costs	2,748	2,846	6,211	5,832
Sublease income	(1,048)	(1,041)	(2,095)	(2,130)
Total lease cost, net	$ 16,580	$ 14,092	$ 31,567	$ 28,310

Leases - Maturity Analysis (Det

Leases - Maturity Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021 (remaining)	$ 5,623
2022	49,443
2023	45,999
2024	40,781
2025	34,871
Thereafter	172,048
Total future lease payments	348,765
Less: imputed interest	(83,418)
Total lease liabilities	$ 265,347	$ 204,393

Leases - Cash Paid For Operatin

Leases - Cash Paid For Operating Leases and Noncash Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 31,050	$ 26,986
Operating lease assets obtained in exchange for lease liabilities	$ 85,221	$ 11,954
Weighted average remaining lease term (years)	8 years 9 months 18 days	6 years 3 months 18 days
Weighted average discount rate	5.50%	5.50%

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards forfeited (in shares)	0
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards granted (in shares)	87,787
Stock options forfeited (in shares)	7,943
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards granted (in shares)	35,226
Performance-based Restricted Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards granted (in shares)	103,220
Award vesting rights, percentage	150.00%
Forfeited in period (in shares)	27,221

Share-Based Compensation - Sche

Share-Based Compensation - Schedule Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 5,075	$ 4,866	$ 14,663	$ 13,800
Direct cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	2,666	2,141	7,731	7,864
Selling, general and administrative expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total share-based compensation expense	$ 2,409	$ 2,725	$ 6,932	$ 5,936

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 03, 2020	Jul. 28, 2020	Feb. 20, 2020	Feb. 21, 2019	Dec. 01, 2017	May 18, 2017	Jun. 02, 2016
Stockholders Equity [Line Items]
Common stock, par value (in dollars per share)	$ 0.01				$ 0.01		$ 0.01
Reduction to additional paid in capital		$ (46,133,000)	$ (51,053,000)	$ (50,311,000)
Reduction in retained earnings	$ (1,590,467,000)				$ (1,590,467,000)		$ (1,506,271,000)
Common stock, shares outstanding (in shares)	34,282				34,282		34,481
Additional Paid-in Capital
Stockholders Equity [Line Items]
Reduction to additional paid in capital		$ (3,047,000)	(51,048,000)	$ (50,306,000)	$ (3,000,000)
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Stock repurchase program authorized amount	$ 900,000,000				900,000,000									$ 100,000,000
Stock repurchase program additional amount authorized								$ 200,000,000	$ 200,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000
Available amount under repurchase program	167,100,000				167,100,000
Reduction to additional paid in capital	0		$ (51,043,000)		(46,124,000)	$ (101,344,000)
Reduction in retained earnings	$ (43,100,000)				$ (43,100,000)

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Stockholders Equity [Line Items]
Total cost		$ 46,133	$ 51,053	$ 50,311
2016 Stock Repurchase Program
Stockholders Equity [Line Items]
Shares of common stock repurchased and retired (in shares)	0		471		422	921
Average price paid per share (in dollars per share)	$ 0		$ 108.41		$ 109.37	$ 110.03
Total cost	$ 0		$ 51,043		$ 46,124	$ 101,344

Segment Reporting - Additional

Segment Reporting - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021segmentoffering
Segment Reporting Information [Line Items]
Number of reportable segments | segment	5
Corporate Finance
Segment Reporting Information [Line Items]
Number of core offerings	3
FLC
Segment Reporting Information [Line Items]
Number of core offerings	5
Economic Consulting
Segment Reporting Information [Line Items]
Number of core offerings	3
Strategic Communications
Segment Reporting Information [Line Items]
Number of core offerings	3

Segment Reporting - Revenues an

Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 711,486	$ 607,852	$ 1,397,763	$ 1,212,445
Adjusted Segment EBITDA	120,894	105,380	246,340	211,504
Corporate Finance
Segment Reporting Information [Line Items]
Revenues	230,971	246,011	457,174	453,760
Adjusted Segment EBITDA	40,174	76,264	77,613	125,210
FLC
Segment Reporting Information [Line Items]
Revenues	150,746	106,381	301,567	253,978
Adjusted Segment EBITDA	18,002	(9,047)	47,434	12,161
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	183,306	151,493	352,579	283,631
Adjusted Segment EBITDA	30,699	21,694	57,278	34,404
Technology
Segment Reporting Information [Line Items]
Revenues	78,646	47,084	158,105	105,807
Adjusted Segment EBITDA	18,518	6,435	40,116	20,919
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	67,817	56,883	128,338	115,269
Adjusted Segment EBITDA	$ 13,501	$ 10,034	$ 23,899	$ 18,810

Segment Reporting - Reconciliat

Segment Reporting - Reconciliation of Net Income To Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income	$ 62,782	$ 64,496	$ 48,174	$ 56,747	$ 127,278	$ 104,921
Income tax provision	14,992		14,470		35,239	30,935
Interest income and other	912		(2,202)		(122)	(7,219)
Interest expense	5,294		5,157		10,091	10,018
Adjusted Segment EBITDA	120,894		105,380		246,340	211,504
Segment Reconciling Items
Segment Reporting, Other Significant Reconciling Item [Line Items]
Net income	62,782		48,174		127,278	104,921
Income tax provision	14,992		14,470		35,239	30,935
Interest income and other	912		(2,202)		(122)	(7,219)
Interest expense	5,294		5,157		10,091	10,018
Unallocated corporate expenses	29,357		30,276		56,067	53,867
Segment depreciation expense	7,834		7,191		15,264	14,337
Amortization of intangible assets	2,853		2,314		5,653	4,645
Remeasurement of acquisition-related contingent consideration	(3,130)		0		(3,130)	0
Adjusted Segment EBITDA	$ 120,894		$ 105,380		$ 246,340	$ 211,504