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Summary of Fixed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]    
Property, plant and Equipment, gross $ 80,716 $ 79,254
Accumulated depreciation and amortization (58,923) (57,777)
Property, plant and Equipment, net 21,793 21,477
Furniture and equipment
   
Property, Plant and Equipment [Line Items]    
Property, plant and Equipment, gross 38,592 37,732
Leasehold improvements
   
Property, Plant and Equipment [Line Items]    
Property, plant and Equipment, gross 22,031 21,536
Software
   
Property, Plant and Equipment [Line Items]    
Property, plant and Equipment, gross $ 20,093 $ 19,986