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Segment Information - Summary of Financial Information by Operating Segment, Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill:
Goodwill	$ 2,775,006
Accumulated impairment loss	(325,875)
Net goodwill, beginning balance	2,449,131
Increase from contribution of redeemable noncontrolling interests	20,300
Prior period purchase price adjustments	(40)
Foreign currency translation loss	(8,669)
Goodwill	2,786,597
Accumulated impairment loss	(325,875)
Net goodwill, ending balance	2,460,722
U.S. Facilities [Member] | Operating Segment [Member]
Goodwill:
Goodwill	2,085,104
Net goodwill, beginning balance	2,085,104
Increase from contribution of redeemable noncontrolling interests	20,300
Prior period purchase price adjustments	(40)
Goodwill	2,105,364
Net goodwill, ending balance	2,105,364
U.K. Facilities [Member] | Operating Segment [Member]
Goodwill:
Goodwill	689,902
Accumulated impairment loss	(325,875)
Net goodwill, beginning balance	364,027
Foreign currency translation loss	(8,669)
Goodwill	681,233
Accumulated impairment loss	(325,875)
Net goodwill, ending balance	$ 355,358

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