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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

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- Definition

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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