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Segment Information - Summary of Financial Information by Operating Segment, Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill:
Goodwill	$ 2,775,006
Accumulated impairment loss	(325,875)
Net goodwill, beginning balance	2,449,131
Prior period purchase price adjustments	(43)
Foreign currency translation loss	(23,716)
Goodwill	2,751,247
Accumulated impairment loss	(325,875)
Net goodwill, ending balance	2,425,372
U.S. Facilities [Member] | Operating Segment [Member]
Goodwill:
Goodwill	2,085,104
Net goodwill, beginning balance	2,085,104
Prior period purchase price adjustments	(43)
Goodwill	2,085,061
Net goodwill, ending balance	2,085,061
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	(23,716)
Goodwill	666,186
Accumulated impairment loss	(325,875)
Net goodwill, ending balance	$ 340,311

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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