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Net Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 105,115 $ 86,236
Less: accumulated depreciation and amortization (47,768) (44,950)
Property and equipment, net 57,347 41,286
Computer and office equipment
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 72,163 56,706
Leasehold improvements
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives Lesser of useful life of improvement or remaining life of lease  
Property and equipment, gross 15,210 10,369
Furniture and fixtures
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives 7 years  
Property and equipment, gross 10,537 13,894
Building and improvements
    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 5,869 4,082
Building and improvements | Minimum
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives 7 years  
Building and improvements | Maximum
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives 30 years  
Land
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives Non depreciable  
Property and equipment, gross $ 1,336 $ 1,185
Computer and office equipment | Minimum
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives 3 years  
Computer and office equipment | Maximum
    
Property, Plant and Equipment [Line Items]    
Property, plant & equipment useful lives 5 years