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Property and Equipment, net - Detail of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment	$ 302,512	$ 309,937
Less: accumulated amortization and depreciation	(112,562)	(113,785)
Property and equipment, net	189,950	196,152
Website development costs
Property, Plant and Equipment [Line Items]
Property and equipment	115,198	95,466
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	102,204	110,280
Office equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	34,080	39,607
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment	31,939	44,151
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment	$ 19,091	$ 20,433

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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