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Special Charges By Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Special Charges [Line Items]                
Special charges $ 27,568 $ 10,419 $ 427 $ 2,775 $ 26,782 $ 38,414 $ 29,557 $ 15,212
Corporate Finance / Restructuring
               
Special Charges [Line Items]                
Special charges           10,274 11,332 9,440
Forensic and Litigation Consulting
               
Special Charges [Line Items]                
Special charges           2,111 8,276 839
Economic Consulting
               
Special Charges [Line Items]                
Special charges           11 991 2,093
Technology
               
Special Charges [Line Items]                
Special charges           16 3,114  
Strategic Communications
               
Special Charges [Line Items]                
Special charges           66 4,712  
Total Reportable Segments
               
Special Charges [Line Items]                
Special charges           12,478 28,425 12,372
Unallocated Corporate
               
Special Charges [Line Items]                
Special charges           $ 25,936 $ 1,132 $ 2,840