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Property and Equipment - Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 156,657 $ 113,667
Less: accumulated depreciation (59,680) (38,107)
Total property and equipment, net 96,977 75,560
Computer Equipment And Software [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 122,398 90,617
Furniture and Fixtures [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 15,672 13,751
Leasehold Improvements [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 13,978 8,371
Construction in Progress [Member]
   
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 4,609 $ 928