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Changes in Carrying Amounts of Goodwill by Operating Segment (Detail)
$ in Thousands
9 Months Ended
Sep. 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 70
Foreign currency translation adjustments and other (12,269)
Goodwill 1,393,629
Accumulated goodwill impairment (194,139)
Goodwill, net at September 30, 2015 1,199,490
Corporate Finance & Restructuring  
Goodwill [Line Items]  
Goodwill 446,066
Goodwill, net at December 31, 2014 446,066
Acquisitions 70
Foreign currency translation adjustments and other (5,652)
Goodwill 440,484
Goodwill, net at September 30, 2015 440,484
Forensic and Litigation Consulting  
Goodwill [Line Items]  
Goodwill 238,173
Goodwill, net at December 31, 2014 238,173
Foreign currency translation adjustments and other (2,185)
Goodwill 235,988
Goodwill, net at September 30, 2015 235,988
Economic Consulting  
Goodwill [Line Items]  
Goodwill 269,897
Goodwill, net at December 31, 2014 269,897
Foreign currency translation adjustments and other (350)
Goodwill 269,547
Goodwill, net at September 30, 2015 269,547
Technology  
Goodwill [Line Items]  
Goodwill 117,967
Goodwill, net at December 31, 2014 117,967
Foreign currency translation adjustments and other (41)
Goodwill 117,926
Goodwill, net at September 30, 2015 117,926
Strategic Communications  
Goodwill [Line Items]  
Goodwill 333,725
Accumulated goodwill impairment (194,139)
Goodwill, net at December 31, 2014 139,586
Foreign currency translation adjustments and other (4,041)
Goodwill 329,684
Accumulated goodwill impairment (194,139)
Goodwill, net at September 30, 2015 $ 135,545