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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 702,228 $ 622,249 $ 2,099,991 $ 1,834,694
Adjusted Segment EBITDA 125,496 115,892 371,836 327,396
Corporate Finance        
Segment Reporting Information [Line Items]        
Revenues 250,321 236,615 707,495 690,375
Adjusted Segment EBITDA 55,635 56,215 133,248 181,425
FLC        
Segment Reporting Information [Line Items]        
Revenues 145,264 119,104 446,831 373,082
Adjusted Segment EBITDA 16,620 13,591 64,054 25,752
Economic Consulting        
Segment Reporting Information [Line Items]        
Revenues 172,543 154,978 525,122 438,609
Adjusted Segment EBITDA 29,917 25,720 87,195 60,124
Technology        
Segment Reporting Information [Line Items]        
Revenues 64,657 58,585 222,762 164,392
Adjusted Segment EBITDA 7,835 11,939 47,951 32,858
Strategic Communications        
Segment Reporting Information [Line Items]        
Revenues 69,443 52,967 197,781 168,236
Adjusted Segment EBITDA $ 15,489 $ 8,427 $ 39,388 $ 27,237