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Revenues And Adjusted Segment EBITDA For Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenues $ 396,243 $ 400,437 $ 791,471 $ 762,253
Adjusted Segment EBITDA 83,148 [1] 77,586 [1] 158,157 [1] 148,168 [1]
Corporate Finance / Restructuring
       
Segment Reporting Information [Line Items]        
Revenues 112,336 101,896 225,814 209,150
Adjusted Segment EBITDA 29,210 14,075 55,974 31,677
Forensic And Litigation Consulting
       
Segment Reporting Information [Line Items]        
Revenues 90,107 93,368 177,138 176,281
Adjusted Segment EBITDA 17,628 17,932 29,705 33,924
Economic Consulting
       
Segment Reporting Information [Line Items]        
Revenues 99,455 94,480 199,507 168,739
Adjusted Segment EBITDA 18,491 18,823 36,915 31,985
Technology
       
Segment Reporting Information [Line Items]        
Revenues 47,697 57,130 97,357 108,165
Adjusted Segment EBITDA 12,849 20,313 26,064 38,743
Strategic Communications
       
Segment Reporting Information [Line Items]        
Revenues 46,648 53,563 91,655 99,918
Adjusted Segment EBITDA $ 4,970 $ 6,443 $ 9,499 $ 11,839
[1] Total Adjusted Segment EBITDA is the total of Adjusted Segment EBITDA for all segments.