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Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net revenues		$ 2,681,353	$ 2,612,356	$ 5,368,869	$ 5,225,214
Total assets		11,069,417	10,552,487	11,069,417	10,552,487	$ 10,761,828
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,274,083	1,242,561	2,512,079	2,460,683
Total assets	[1]	6,746,272	6,541,328	6,746,272	6,541,328
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		119,000	106,000	234,000	206,000
Total assets		$ 1,123,000	$ 1,028,000	$ 1,123,000	$ 1,028,000
[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $119 million and $106 million for the three-month periods ended June 30, 2018 and 2017, respectively, and approximately $234 million and $206 million for the six-month periods ended June 30, 2018 and 2017 respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.123 billion and $1.028 billion as of June 30, 2018 and 2017, respectively.

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