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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, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Beginning Balance $ 1,218,733  
Acquisitions 71 [1]  
Foreign currency translation adjustment and other 2,514  
Goodwill 1,415,457 1,412,872
Accumulated goodwill impairment (194,139) (194,139)
Ending Balance 1,221,318  
Corporate Finance / Restructuring
    
Goodwill [Line Items]    
Beginning Balance 449,710  
Foreign currency translation adjustment and other 939  
Goodwill 450,649 449,710
Ending Balance 450,649  
Forensic and Litigation Consulting
    
Goodwill [Line Items]    
Beginning Balance 241,651  
Acquisitions 71 [1]  
Foreign currency translation adjustment and other 388  
Goodwill 242,110 241,651
Ending Balance 242,110  
Economic Consulting
    
Goodwill [Line Items]    
Beginning Balance 263,474  
Foreign currency translation adjustment and other 60  
Goodwill 263,534 263,474
Ending Balance 263,534  
Technology
    
Goodwill [Line Items]    
Beginning Balance 118,073  
Foreign currency translation adjustment and other 17  
Goodwill 118,090 118,073
Ending Balance 118,090  
Strategic Communications
    
Goodwill [Line Items]    
Beginning Balance 145,825  
Foreign currency translation adjustment and other 1,110  
Goodwill 341,074 339,964
Accumulated goodwill impairment (194,139) (194,139)
Ending Balance $ 146,935  
[1] Includes adjustments during the purchase price measurement period.