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U.K. Sale - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 19, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from U.K. Sale |  | $ 4,300 |  | $ 1,511,020 |
Discontinued Operations [Member] | U.K. Sales [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from U.K. Sale | $ 1,525,000 |  |  |  |
Settlement of existing foreign currency hedging liabilities | 85,000 |  |  |  |
Net proceeds from sale of business | $ 1,425,000 |  |  |  |
Cash from the balance sheet to reduce debt, amount |  |  | $ 1,640,000 |  |
Loss on sale |  |  | $ 14,300 |  | $ 867,300
Goodwill impairment loss |  |  |  |  | $ 356,200

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