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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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Fair value of all liability derivatives designated as cash flow hedging instruments.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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