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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Beginning Balance $ 1,218,733  
Acquisitions (224) [1]  
Foreign currency translation adjustment and other 6,894  
Goodwill 1,419,542 1,412,872
Accumulated goodwill impairment (194,139) (194,139)
Ending Balance 1,225,403  
Corporate Finance / Restructuring
    
Goodwill [Line Items]    
Beginning Balance 449,710  
Foreign currency translation adjustment and other 2,088  
Goodwill 451,798 449,710
Ending Balance 451,798  
Forensic and Litigation Consulting
    
Goodwill [Line Items]    
Beginning Balance 241,651  
Acquisitions (224) [1]  
Foreign currency translation adjustment and other 1,179  
Goodwill 242,606 241,651
Ending Balance 242,606  
Economic Consulting
    
Goodwill [Line Items]    
Beginning Balance 263,474  
Foreign currency translation adjustment and other 205  
Goodwill 263,679 263,474
Ending Balance 263,679  
Technology
    
Goodwill [Line Items]    
Beginning Balance 118,073  
Foreign currency translation adjustment and other 62  
Goodwill 118,135 118,073
Ending Balance 118,135  
Strategic Communications
    
Goodwill [Line Items]    
Beginning Balance 145,825  
Foreign currency translation adjustment and other 3,360  
Goodwill 343,324 339,964
Accumulated goodwill impairment (194,139) (194,139)
Ending Balance $ 149,185  
[1] Includes adjustments during the purchase price measurement period.