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Quarterly Information (Unaudited) - Schedule of Quarterly Financial Information (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Information [Line Items] |  |
Loss on impairment | $ 4,751 | $ 27,217
Discontinued Operations [Member] | U.K. Sales [Member] |  |
Quarterly Financial Information [Line Items] |  |
Loss on sale | (867,300) |
Non-cash goodwill impairment | $ 356,200 |
Loss on impairment |  | $ 27,200

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