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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Goodwill [Line Items]  
Balances at December 31, 2012 $ 1,260,035
Acquisitions 2,514 [1]
Foreign currency translation adjustment and other (10,109)
Balances at March 31, 2013 1,252,440
Corporate Finance / Restructuring
 
Goodwill [Line Items]  
Balances at December 31, 2012 469,050
Acquisitions (6,317) [1]
Foreign currency translation adjustment and other (503)
Intersegment transfers in/(out) (31,471) [2]
Balances at March 31, 2013 430,759
Forensic and Litigation Consulting
 
Goodwill [Line Items]  
Balances at December 31, 2012 198,957
Acquisitions 1,441 [1]
Foreign currency translation adjustment and other (1,781)
Intersegment transfers in/(out) 31,471 [2]
Balances at March 31, 2013 230,088
Economic Consulting
 
Goodwill [Line Items]  
Balances at December 31, 2012 247,718
Foreign currency translation adjustment and other (553)
Balances at March 31, 2013 247,165
Technology
 
Goodwill [Line Items]  
Balances at December 31, 2012 118,035
Foreign currency translation adjustment and other (107)
Balances at March 31, 2013 117,928
Strategic Communications
 
Goodwill [Line Items]  
Balances at December 31, 2012 226,275
Acquisitions 7,390 [1]
Foreign currency translation adjustment and other (7,165)
Balances at March 31, 2013 $ 226,500
[1] Includes adjustments during the purchase price allocation period.
[2] Includes the reclassification of the Corporate Finance/Restructuring segment's healthcare practice into the Forensic and Litigation Consulting segment. See Note 15 "Segment Reporting" for information on this segment reclassification.