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Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 28,763 $ 26,345
Less: accumulated depreciation and amortization (22,796) (20,340)
Property and equipment, net 5,967 6,005
Computer and Other Related Equipment
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 17,947 15,842
Purchased and Internally Developed Software
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 7,672 7,452
Furniture and Fixtures
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,313 1,242
Leasehold Improvements
   
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,831 $ 1,809