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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]      
Goodwill     $ 1,370,422
Accumulated goodwill impairment     (110,387)
Goodwill, net as of December 31, 2012   1,260,035  
Acquisitions   25,794 [1]  
Foreign currency translation adjustment and other   (7,663)  
Goodwill impairment (83,752) (83,752)  
Balances at September 30, 2013 1,194,414 1,194,414  
Corporate Finance / Restructuring
      
Goodwill [Line Items]      
Goodwill     469,050
Goodwill, net as of December 31, 2012   469,050  
Acquisitions   18,839 [1]  
Foreign currency translation adjustment and other   (4,630)  
Intersegment transfers in/(out)   (31,471) [2]  
Balances at September 30, 2013 451,788 451,788  
Forensic and Litigation Consulting
      
Goodwill [Line Items]      
Goodwill     198,957
Goodwill, net as of December 31, 2012   198,957  
Acquisitions   1,050 [1]  
Foreign currency translation adjustment and other   (349)  
Intersegment transfers in/(out)   31,471 [2]  
Balances at September 30, 2013 231,129 231,129  
Economic Consulting
      
Goodwill [Line Items]      
Goodwill     247,718
Goodwill, net as of December 31, 2012   247,718  
Acquisitions   944 [1]  
Foreign currency translation adjustment and other   (1)  
Balances at September 30, 2013 248,661 248,661  
Technology
      
Goodwill [Line Items]      
Goodwill     118,035
Goodwill, net as of December 31, 2012   118,035  
Foreign currency translation adjustment and other   (1)  
Balances at September 30, 2013 118,034 118,034  
Strategic Communications
      
Goodwill [Line Items]      
Goodwill     336,662
Accumulated goodwill impairment     (110,387)
Goodwill, net as of December 31, 2012   226,275  
Acquisitions   4,961 [1]  
Foreign currency translation adjustment and other   (2,682)  
Goodwill impairment   (83,752)  
Balances at September 30, 2013 $ 144,802 $ 144,802  
[1] Includes adjustments during the purchase price allocation period.
[2] Includes the reclassification of the Company's Corporate Finance/Restructuring segment's healthcare and life sciences practices into the Forensic and Litigation Consulting segment. See Note 15 "Segment Reporting" for information on this segment reclassification.