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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, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Revenues $ 551,274 $ 497,774
Adjusted Segment EBITDA 117,490 95,281
Corporate Finance    
Segment Reporting Information [Line Items]    
Revenues 160,966 142,922
Adjusted Segment EBITDA 37,361 34,804
FLC    
Segment Reporting Information [Line Items]    
Revenues 138,997 128,039
Adjusted Segment EBITDA 31,817 25,757
Economic Consulting    
Segment Reporting Information [Line Items]    
Revenues 142,271 133,109
Adjusted Segment EBITDA 24,040 19,136
Technology    
Segment Reporting Information [Line Items]    
Revenues 51,336 40,914
Adjusted Segment EBITDA 12,723 5,732
Strategic Communications    
Segment Reporting Information [Line Items]    
Revenues 57,704 52,790
Adjusted Segment EBITDA $ 11,549 $ 9,852