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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 3,489,242	$ 3,028,908	$ 2,776,222
Adjusted Segment EBITDA	548,373	478,790	455,265
Corporate Finance
Segment Reporting Information [Line Items]
Revenues	1,346,678	1,147,118	979,350
Adjusted Segment EBITDA	230,837	214,809	158,019
FLC
Segment Reporting Information [Line Items]
Revenues	654,105	579,933	544,454
Adjusted Segment EBITDA	88,109	63,573	70,008
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	771,374	695,208	697,405
Adjusted Segment EBITDA	115,807	103,090	117,186
Technology
Segment Reporting Information [Line Items]
Revenues	387,855	319,983	287,366
Adjusted Segment EBITDA	62,711	46,698	55,739
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	329,230	286,666	267,647
Adjusted Segment EBITDA	$ 50,909	$ 50,620	$ 54,313

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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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