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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail) - Entity [Domain]
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
Goodwill [Line Items]  
Goodwill $ 1,405,828
Accumulated goodwill impairment (194,139)
Goodwill, net at December 31, 2014 1,211,689
Acquisitions 427
Foreign currency translation adjustment and other (3,608)
Goodwill 1,402,647
Accumulated goodwill impairment (194,139)
Goodwill, net at June 30, 2015 1,208,508
Corporate Finance / Restructuring  
Goodwill [Line Items]  
Goodwill 446,066
Goodwill, net at December 31, 2014 446,066
Acquisitions 427
Foreign currency translation adjustment and other (2,474)
Goodwill 444,019
Goodwill, net at June 30, 2015 444,019
Forensic and Litigation Consulting  
Goodwill [Line Items]  
Goodwill 238,173
Goodwill, net at December 31, 2014 238,173
Foreign currency translation adjustment and other (758)
Goodwill 237,415
Goodwill, net at June 30, 2015 237,415
Economic Consulting  
Goodwill [Line Items]  
Goodwill 269,897
Goodwill, net at December 31, 2014 269,897
Foreign currency translation adjustment and other (149)
Goodwill 269,748
Goodwill, net at June 30, 2015 269,748
Technology  
Goodwill [Line Items]  
Goodwill 117,967
Goodwill, net at December 31, 2014 117,967
Foreign currency translation adjustment and other 21
Goodwill 117,988
Goodwill, net at June 30, 2015 117,988
Strategic Communications  
Goodwill [Line Items]  
Goodwill 333,725
Accumulated goodwill impairment (194,139)
Goodwill, net at December 31, 2014 139,586
Foreign currency translation adjustment and other (248)
Goodwill 333,477
Accumulated goodwill impairment (194,139)
Goodwill, net at June 30, 2015 $ 139,338