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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Goodwill [Line Items]            
Beginning Balance     $ 1,260,035 $ 1,309,358   $ 14,800
Acquisitions     35,598 [1] 31,644 [1]    
Contingent consideration   18,636 [2] 14,967 [2] 18,636 [2]    
Foreign currency translation adjustment and other     (8,115) 10,784    
Goodwill impairment (83,752) (110,387) (83,752) (110,387)    
Goodwill   1,370,422 1,412,872 1,370,422 1,309,358  
Accumulated goodwill impairment   (110,387) (194,139) (110,387)    
Ending Balance   1,260,035 1,218,733 1,260,035   14,800
Corporate Finance / Restructuring
            
Goodwill [Line Items]            
Beginning Balance     469,050 436,043    
Acquisitions     18,713 [1] 31,644 [1]    
Contingent consideration   905 [2] 437 [2] 905 [2]    
Foreign currency translation adjustment and other     (7,019) 458    
Intersegment transfers in/(out)     (31,471) [3]      
Goodwill   469,050 449,710 469,050 436,043  
Ending Balance   469,050 449,710 469,050    
Forensic and Litigation Consulting
            
Goodwill [Line Items]            
Beginning Balance     198,957 198,047    
Acquisitions     10,979 [1]      
Contingent consideration   23 [2]   23 [2]    
Foreign currency translation adjustment and other     244 887    
Intersegment transfers in/(out)     31,471 [3]      
Goodwill   198,957 241,651 198,957 198,047  
Ending Balance   198,957 241,651 198,957    
Economic Consulting
            
Goodwill [Line Items]            
Beginning Balance     247,718 229,487    
Acquisitions     945 [1]      
Contingent consideration   17,708 [2] 14,530 [2] 17,708 [2]    
Foreign currency translation adjustment and other     281 523    
Goodwill   247,718 263,474 247,718 229,487  
Ending Balance   247,718 263,474 247,718    
Technology
            
Goodwill [Line Items]            
Beginning Balance     118,035 117,958    
Foreign currency translation adjustment and other     38 77    
Goodwill   118,035 118,073 118,035 117,958  
Ending Balance   118,035 118,073 118,035    
Strategic Communications
            
Goodwill [Line Items]            
Beginning Balance     226,275 327,823    
Acquisitions     4,961 [1]      
Foreign currency translation adjustment and other     (1,659) 8,839    
Goodwill impairment     (83,752) (110,387)    
Goodwill   336,662 339,964 336,662 327,823  
Accumulated goodwill impairment   (110,387) (194,139) (110,387)    
Ending Balance   $ 226,275 $ 145,825 $ 226,275    
[1] Includes adjustments during the purchase price allocation period.
[2] Contingent consideration is related to business combinations consummated prior to January 1, 2009.
[3] 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 19 "Segment Reporting" for information on this segment reclassification.