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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Revenues $ 438,042 $ 455,470 $ 1,368,474 $ 1,336,945
Adjusted Segment EBITDA 67,577 76,252 230,325 223,284
Corporate Finance & Restructuring        
Segment Reporting Information [Line Items]        
Revenues 110,617 113,487 369,915 328,812
Adjusted Segment EBITDA 17,762 26,662 81,406 71,174
Forensic and Litigation Consulting        
Segment Reporting Information [Line Items]        
Revenues 115,045 116,158 352,242 365,554
Adjusted Segment EBITDA 16,554 13,406 51,552 55,456
Economic Consulting        
Segment Reporting Information [Line Items]        
Revenues 122,480 114,541 371,217 329,320
Adjusted Segment EBITDA 18,354 16,654 55,054 43,502
Technology        
Segment Reporting Information [Line Items]        
Revenues 44,072 55,568 134,235 172,048
Adjusted Segment EBITDA 7,398 10,813 20,256 33,052
Strategic Communications        
Segment Reporting Information [Line Items]        
Revenues 45,828 55,716 140,865 141,211
Adjusted Segment EBITDA $ 7,509 $ 8,717 $ 22,057 $ 20,100