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Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Revenues $ 470,285 $ 432,338
Adjusted Segment EBITDA 86,661 71,932
Corporate Finance & Restructuring    
Segment Reporting Information [Line Items]    
Revenues 127,156 106,212
Adjusted Segment EBITDA 31,603 22,480
Forensic and Litigation Consulting    
Segment Reporting Information [Line Items]    
Revenues 119,004 123,265
Adjusted Segment EBITDA 19,808 22,071
Economic Consulting    
Segment Reporting Information [Line Items]    
Revenues 130,731 106,081
Adjusted Segment EBITDA 21,319 11,556
Technology    
Segment Reporting Information [Line Items]    
Revenues 48,281 54,654
Adjusted Segment EBITDA 7,823 10,073
Strategic Communications    
Segment Reporting Information [Line Items]    
Revenues 45,113 42,126
Adjusted Segment EBITDA $ 6,108 $ 5,752