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Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Revenues $ 414,643 $ 386,055 $ 1,236,434 $ 1,177,526
Adjusted Segment EBITDA 87,406 [1] 79,780 [1] 250,492 [1] 237,937 [1]
Corporate Finance / Restructuring
       
Segment Reporting Information [Line Items]        
Revenues 93,981 93,123 289,775 286,184
Adjusted Segment EBITDA 19,402 21,951 62,610 73,419
Forensic and Litigation Consulting
       
Segment Reporting Information [Line Items]        
Revenues 113,068 100,460 318,912 310,351
Adjusted Segment EBITDA 25,362 16,289 58,866 50,500
Economic Consulting
       
Segment Reporting Information [Line Items]        
Revenues 113,069 96,375 339,277 295,882
Adjusted Segment EBITDA 23,225 19,087 70,222 56,002
Technology
       
Segment Reporting Information [Line Items]        
Revenues 51,201 50,286 149,101 147,643
Adjusted Segment EBITDA 15,381 15,675 45,985 41,739
Strategic Communications
       
Segment Reporting Information [Line Items]        
Revenues 43,324 45,811 139,369 137,466
Adjusted Segment EBITDA $ 4,036 $ 6,778 $ 12,809 $ 16,277
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.