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Segment Information - Summary of Financial Information by Operating Segment, Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill:
Beginning balance	$ 2,396,412
Increase from 2019 acquisitions	36,567
Increase from contribution of redeemable noncontrolling interests	3,300
Foreign currency translation loss	(12,038)
Ending balance	2,424,241
U.S. Facilities [Member] | Operating Segment [Member]
Goodwill:
Beginning balance	2,044,837
Increase from 2019 acquisitions	36,567
Increase from contribution of redeemable noncontrolling interests	3,300
Ending balance	2,084,704
U.K. Facilities [Member] | Operating Segment [Member]
Goodwill:
Beginning balance	351,575
Foreign currency translation loss	(12,038)
Ending balance	$ 339,537

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