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Segment Information - Summary of Financial Information by Operating Segment, Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Goodwill:
Beginning balance	$ 2,396,412
Increase from 2019 acquisitions	36,528
Increase from contribution of redeemable noncontrolling interests	3,300
Foreign currency translation loss	(1,215)
Ending balance	2,435,025
U.S. Facilities [Member] | Operating Segment [Member]
Goodwill:
Beginning balance	2,044,837
Increase from 2019 acquisitions	36,528
Increase from contribution of redeemable noncontrolling interests	3,300
Ending balance	2,084,665
U.K. Facilities [Member] | Operating Segment [Member]
Goodwill:
Beginning balance	351,575
Foreign currency translation loss	(1,215)
Ending balance	$ 350,360

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