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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
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Revenues $ 407,178 $ 395,228
Adjusted Segment EBITDA 75,360 [1] 75,009 [1]
Corporate Finance / Restructuring
   
Segment Reporting Information [Line Items]    
Revenues 99,080 96,874
Adjusted Segment EBITDA 19,085 24,171
Forensic and Litigation Consulting
   
Segment Reporting Information [Line Items]    
Revenues 100,724 103,635
Adjusted Segment EBITDA 12,811 14,670
Economic Consulting
   
Segment Reporting Information [Line Items]    
Revenues 115,194 100,052
Adjusted Segment EBITDA 26,194 18,424
Technology
   
Segment Reporting Information [Line Items]    
Revenues 46,704 49,660
Adjusted Segment EBITDA 13,716 13,215
Strategic Communications
   
Segment Reporting Information [Line Items]    
Revenues 45,476 45,007
Adjusted Segment EBITDA $ 3,554 $ 4,529
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.