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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 626,581	$ 622,249	$ 607,852	$ 604,593	$ 602,218	$ 593,106	$ 606,119	$ 551,274	$ 2,461,275	$ 2,352,717	$ 2,027,877
Adjusted Segment EBITDA									423,624	439,514	358,741
Corporate Finance
Segment Reporting Information [Line Items]
Revenues									910,184	723,721	564,479
Adjusted Segment EBITDA									216,830	160,735	121,660
FLC
Segment Reporting Information [Line Items]
Revenues									500,275	577,780	520,333
Adjusted Segment EBITDA									33,374	104,435	96,821
Economic Consulting
Segment Reporting Information [Line Items]
Revenues									599,088	592,542	533,979
Adjusted Segment EBITDA									91,432	84,112	69,955
Technology
Segment Reporting Information [Line Items]
Revenues									223,016	215,584	185,755
Adjusted Segment EBITDA									43,013	45,688	27,387
Strategic Communications
Segment Reporting Information [Line Items]
Revenues									228,712	243,090	223,331
Adjusted Segment EBITDA									$ 38,975	$ 44,544	$ 42,918

X

- Definition

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.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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