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U.K. Sale - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Jan. 19, 2021	Mar. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from U.K. Sale		$ 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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