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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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenues $ 415,998 $ 414,643 $ 414,613 $ 407,178 $ 399,345 $ 386,055 $ 396,243 $ 395,228 $ 1,652,432 $ 1,576,871 $ 1,566,768
Adjusted Segment EBITDA                 326,815 [1] 321,392 [1] 337,658 [1]
Corporate Finance / Restructuring
                     
Segment Reporting Information [Line Items]                      
Revenues                 382,526 394,719 364,409
Adjusted Segment EBITDA                 78,797 101,137 84,933
Forensic and Litigation Consulting
                     
Segment Reporting Information [Line Items]                      
Revenues                 433,632 407,586 428,730
Adjusted Segment EBITDA                 76,422 60,572 81,885
Economic Consulting
                     
Segment Reporting Information [Line Items]                      
Revenues                 447,366 391,622 353,981
Adjusted Segment EBITDA                 92,204 77,461 67,028
Technology
                     
Segment Reporting Information [Line Items]                      
Revenues                 202,663 195,194 218,738
Adjusted Segment EBITDA                 60,655 57,203 77,011
Strategic Communications
                     
Segment Reporting Information [Line Items]                      
Revenues                 186,245 187,750 200,910
Adjusted Segment EBITDA                 $ 18,737 $ 25,019 $ 26,801
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments