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Segment Information - Summary of Financial Information by Operating Segment, Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill:
Goodwill	$ 2,722,287	$ 2,751,174
Accumulated impairment loss	(325,875)
Net goodwill, beginning balance	2,396,412	2,751,174
Loss on impairment		(325,875)
Increase from contribution of redeemable noncontrolling interests	3,300	2,245
Increase from 2019 acquisitions	36,967
Foreign currency translation loss	12,452	(31,894)
Prior year purchase price adjustments		762
Goodwill	2,775,006	2,722,287
Accumulated impairment loss	(325,875)	(325,875)
Net goodwill, ending balance	2,449,131	2,396,412
U.S. Facilities [Member] | Operating Segment [Member]
Goodwill:
Goodwill	2,044,837	2,042,592
Net goodwill, beginning balance	2,044,837	2,042,592
Increase from contribution of redeemable noncontrolling interests	3,300	2,245
Increase from 2019 acquisitions	36,967
Goodwill	2,085,104	2,044,837
Net goodwill, ending balance	2,085,104	2,044,837
U.K. Facilities [Member] | Operating Segment [Member]
Goodwill:
Goodwill	677,450	708,582
Accumulated impairment loss	(325,875)
Net goodwill, beginning balance	351,575	708,582
Loss on impairment		(325,875)
Foreign currency translation loss	12,452	(31,894)
Prior year purchase price adjustments		762
Goodwill	689,902	677,450
Accumulated impairment loss	(325,875)	(325,875)
Net goodwill, ending balance	$ 364,027	$ 351,575

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