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Property and Equipment, net - Detail of Property and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment $ 399,810 $ 345,490
Less: accumulated amortization and depreciation (201,567) (175,001)
Property and equipment, net 198,243 170,489
Website development costs    
Property, Plant and Equipment [Line Items]    
Property and equipment 165,950 149,648
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment 120,259 81,981
Office equipment, furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property and equipment 43,311 36,582
Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Property and equipment 39,730 45,337
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 30,560 $ 31,942