Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues		$ 2,612,356	$ 2,430,855	$ 5,225,214	$ 4,880,653
Total assets		10,552,487	9,540,930	10,552,487	9,540,930	$ 10,317,802
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,242,561	1,174,755	2,460,683	2,335,801
Total assets	[1]	6,541,328	5,920,483	6,541,328	5,920,483
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		106,000	64,000	206,000	125,000
Total assets		$ 1,028,000	$ 490,000	$ 1,028,000	$ 490,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $106 million and $64 million for the three-month periods ended June 30, 2017 and 2016, respectively, and approximately $206 million and $125 million for the six-month periods ended June 30, 2017 and 2016, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1,028 million and $490 million as of June 30, 2017 and 2016, respectively.