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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 926,019	$ 893,261	$ 2,803,728	$ 2,564,558
Adjusted Segment EBITDA	141,743	145,657	450,132	397,382
Corporate Finance
Segment Reporting Information [Line Items]
Revenues	341,512	347,560	1,055,493	981,124
Adjusted Segment EBITDA	57,919	68,094	199,611	165,450
FLC
Segment Reporting Information [Line Items]
Revenues	168,778	166,137	514,348	488,636
Adjusted Segment EBITDA	19,991	21,480	68,694	68,861
Economic Consulting
Segment Reporting Information [Line Items]
Revenues	222,033	193,866	657,454	565,283
Adjusted Segment EBITDA	35,244	27,756	93,690	77,472
Technology
Segment Reporting Information [Line Items]
Revenues	110,404	98,860	326,992	286,922
Adjusted Segment EBITDA	16,465	14,873	51,976	50,326
Strategic Communications
Segment Reporting Information [Line Items]
Revenues	83,292	86,838	249,441	242,593
Adjusted Segment EBITDA	$ 12,124	$ 13,454	$ 36,161	$ 35,273

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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