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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, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Revenues $ 446,344 $ 470,285
Adjusted Segment EBITDA 56,017 86,661
Corporate Finance & Restructuring    
Segment Reporting Information [Line Items]    
Revenues 105,901 127,156
Adjusted Segment EBITDA 10,325 31,603
Forensic and Litigation Consulting    
Segment Reporting Information [Line Items]    
Revenues 111,406 119,004
Adjusted Segment EBITDA 13,521 19,808
Economic Consulting    
Segment Reporting Information [Line Items]    
Revenues 139,221 130,731
Adjusted Segment EBITDA 20,110 21,319
Technology    
Segment Reporting Information [Line Items]    
Revenues 46,087 48,281
Adjusted Segment EBITDA 7,804 7,823
Strategic Communications    
Segment Reporting Information [Line Items]    
Revenues 43,729 45,113
Adjusted Segment EBITDA $ 4,257 $ 6,108