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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Revenues $ 711,486 $ 607,852 $ 1,397,763 $ 1,212,445
Adjusted Segment EBITDA 120,894 105,380 246,340 211,504
Corporate Finance        
Segment Reporting Information [Line Items]        
Revenues 230,971 246,011 457,174 453,760
Adjusted Segment EBITDA 40,174 76,264 77,613 125,210
FLC        
Segment Reporting Information [Line Items]        
Revenues 150,746 106,381 301,567 253,978
Adjusted Segment EBITDA 18,002 (9,047) 47,434 12,161
Economic Consulting        
Segment Reporting Information [Line Items]        
Revenues 183,306 151,493 352,579 283,631
Adjusted Segment EBITDA 30,699 21,694 57,278 34,404
Technology        
Segment Reporting Information [Line Items]        
Revenues 78,646 47,084 158,105 105,807
Adjusted Segment EBITDA 18,518 6,435 40,116 20,919
Strategic Communications        
Segment Reporting Information [Line Items]        
Revenues 67,817 56,883 128,338 115,269
Adjusted Segment EBITDA $ 13,501 $ 10,034 $ 23,899 $ 18,810