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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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