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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
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues	$ 898,282	$ 928,553
Total segment gross profit	289,354	302,519
Operating Segments
Segment Reporting Information [Line Items]
Revenues	898,282	928,553
Compensation expenses	533,011	544,922
Other segment items	75,917	81,112
Direct costs	608,928	626,034
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	3,600	3,400
Corporate Finance
Segment Reporting Information [Line Items]
Total segment gross profit	112,073	127,820
Corporate Finance | Operating Segments
Segment Reporting Information [Line Items]
Revenues	343,645	366,010
Compensation expenses	210,418	215,440
Other segment items	21,154	22,750
Direct costs	231,572	238,190
FLC
Segment Reporting Information [Line Items]
Total segment gross profit	72,641	63,680
FLC | Operating Segments
Segment Reporting Information [Line Items]
Revenues	190,602	176,074
Compensation expenses	110,878	104,362
Other segment items	7,083	8,032
Direct costs	117,961	112,394
Economic Consulting
Segment Reporting Information [Line Items]
Total segment gross profit	41,416	45,108
Economic Consulting | Operating Segments
Segment Reporting Information [Line Items]
Revenues	179,861	204,548
Compensation expenses	129,105	144,301
Other segment items	9,340	15,139
Direct costs	138,445	159,440
Technology
Segment Reporting Information [Line Items]
Total segment gross profit	32,898	36,644
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenues	97,156	100,713
Compensation expenses	37,131	36,600
Other segment items	27,127	27,469
Direct costs	64,258	64,069
Strategic Communications
Segment Reporting Information [Line Items]
Total segment gross profit	30,326	29,267
Strategic Communications | Operating Segments
Segment Reporting Information [Line Items]
Revenues	87,018	81,208
Compensation expenses	45,479	44,219
Other segment items	11,213	7,722
Direct costs	$ 56,692	$ 51,941

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