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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 3,028,908	$ 2,776,222	$ 2,461,275
Adjusted Segment EBITDA	478,790	455,265	423,624
Corporate Finance
Segment Reporting Information [Line Items]
Revenues	1,088,573	938,969	910,184
Adjusted Segment EBITDA	212,437	155,482	216,830
FLC
Segment Reporting Information [Line Items]
Revenues	638,478	584,835	500,275
Adjusted Segment EBITDA	65,945	72,545	33,374
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	695,208	697,405	599,088
Adjusted Segment EBITDA	103,090	117,186	91,432
Technology
Segment Reporting Information [Line Items]
Revenues	319,983	287,366	223,016
Adjusted Segment EBITDA	46,698	55,739	43,013
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	286,666	267,647	228,712
Adjusted Segment EBITDA	$ 50,620	$ 54,313	$ 38,975

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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