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Property and Equipment, net - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization and depreciation expense related to property and equipment other than website development costs | $ 7.1 | $ 7.1 | $ 15.0 | $ 18.9
Capitalization of website development costs | 14.1 | 15.4 | 26.5 | 27.9
Amortization of website development costs and intangible assets included in technology and development | 13.4 | 13.1 | 26.3 | 24.9
Technology and development | Software Development |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Amortization of website development costs and intangible assets included in technology and development | $ 8.4 | $ 6.0 | $ 16.4 | $ 11.4

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