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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 224,013 $ 180,853
Accumulated depreciation and amortization (71,698) (56,585)
Property and equipment, net 152,315 124,268
Land    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross 9,958 9,958
Building and leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 116,214 94,924
Building and leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 5 years  
Building and leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 39 years  
Computer equipment and purchased software    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 72,531 55,627
Computer equipment and purchased software | Minimum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 3 years  
Computer equipment and purchased software | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 5 years  
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 24,834 19,897
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 5 years  
Transportation equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 476 $ 447
Transportation equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 5 years