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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, Gross $ 244,524 $ 224,013
Accumulated depreciation and amortization (89,347) (71,698)
Property and equipment, net 155,177 152,315
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 $ 122,241 116,214
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 $ 84,649 72,531
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 $ 27,238 24,834
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 $ 438 $ 476
Transportation equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property and equipment, Useful lives 5 years