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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Goodwill gross, beginning balance $ 1,412,872  
Acquisitions (224) [1]  
Foreign currency translation adjustment and other (4,700)  
Goodwill gross, beginning balance 1,407,948  
Accumulated goodwill impairment (194,139) (194,139)
Goodwill net, ending balance 1,213,809 1,218,733
Corporate Finance / Restructuring
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 449,710  
Foreign currency translation adjustment and other (1,280)  
Goodwill gross, beginning balance 448,430  
Goodwill net, ending balance 448,430 449,710
Forensic and Litigation Consulting
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 241,651  
Acquisitions (224) [1]  
Foreign currency translation adjustment and other (1,306)  
Goodwill gross, beginning balance 240,121  
Goodwill net, ending balance 240,121 241,651
Economic Consulting
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 263,474  
Foreign currency translation adjustment and other (326)  
Goodwill gross, beginning balance 263,148  
Goodwill net, ending balance 263,148 263,474
Technology
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 118,073  
Foreign currency translation adjustment and other (28)  
Goodwill gross, beginning balance 118,045  
Goodwill net, ending balance 118,045 118,073
Strategic Communications
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 339,964  
Foreign currency translation adjustment and other (1,760)  
Goodwill gross, beginning balance 338,204  
Accumulated goodwill impairment (194,139) (194,139)
Goodwill net, ending balance $ 144,065 $ 145,825
[1] Includes adjustments during the purchase price measurement period.