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Special Charges By Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Jun. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Special Charges [Line Items]        
Special charges $ 2,775 $ 15,200 $ 29,557 $ 15,212
Corporate Finance / Restructuring
       
Special Charges [Line Items]        
Special charges 820   11,936 9,440
Forensic and Litigation Consulting
       
Special Charges [Line Items]        
Special charges 419   7,672 839
Economic Consulting
       
Special Charges [Line Items]        
Special charges 173   991 2,093
Technology
       
Special Charges [Line Items]        
Special charges 148   3,114  
Strategic Communications
       
Special Charges [Line Items]        
Special charges 201   4,712  
Total Reportable Segments
       
Special Charges [Line Items]        
Special charges 1,761   28,425 12,372
Unallocated Corporate
       
Special Charges [Line Items]        
Special charges $ 1,014   $ 1,132 $ 2,840