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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Revenues $ 414,613 $ 396,243 $ 821,791 $ 791,471
Adjusted Segment EBITDA 87,726 [1] 83,148 [1] 163,086 [1] 158,157 [1]
Corporate Finance / Restructuring
        
Segment Reporting Information [Line Items]        
Revenues 96,714 96,187 195,794 193,061
Adjusted Segment EBITDA 24,123 27,296 43,208 51,468
Forensic and Litigation Consulting
        
Segment Reporting Information [Line Items]        
Revenues 105,120 106,256 205,844 209,891
Adjusted Segment EBITDA 20,693 19,542 33,504 34,211
Economic Consulting
        
Segment Reporting Information [Line Items]        
Revenues 111,014 99,455 226,208 199,507
Adjusted Segment EBITDA 20,803 18,491 46,997 36,915
Technology
        
Segment Reporting Information [Line Items]        
Revenues 51,196 47,697 97,900 97,357
Adjusted Segment EBITDA 16,888 12,849 30,604 26,064
Strategic Communications
        
Segment Reporting Information [Line Items]        
Revenues 50,569 46,648 96,045 91,655
Adjusted Segment EBITDA $ 5,219 $ 4,970 $ 8,773 $ 9,499
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.