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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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]      
Revenues $ 1,576,871 $ 1,566,768 $ 1,401,461
Adjusted Segment EBITDA 321,392 [1] 337,658 [1] 327,364 [1]
Corporate Finance / Restructuring
     
Segment Reporting Information [Line Items]      
Revenues 394,719 364,409 396,216
Adjusted Segment EBITDA 101,137 84,933 108,152
Forensic and Litigation Consulting
     
Segment Reporting Information [Line Items]      
Revenues 407,586 428,730 379,780
Adjusted Segment EBITDA 60,572 81,885 76,402
Economic Consulting
     
Segment Reporting Information [Line Items]      
Revenues 391,622 353,981 255,660
Adjusted Segment EBITDA 77,461 67,028 49,481
Technology
     
Segment Reporting Information [Line Items]      
Revenues 195,194 218,738 176,607
Adjusted Segment EBITDA 57,203 77,011 64,358
Strategic Communications
     
Segment Reporting Information [Line Items]      
Revenues 187,750 200,910 193,198
Adjusted Segment EBITDA $ 25,019 $ 26,801 $ 28,971
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.