Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net revenues		$ 2,612,858	$ 2,449,798
Total assets		10,448,259	9,565,009	$ 10,317,802
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,218,122	1,161,046
Total assets	[1]	6,517,608	5,929,802
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		101,000	61,000
Total assets		$ 992,000	$ 515,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $101 million and $61 million for the three-month periods ended March 31, 2017 and 2016, respectively, and total U.K. behavioral health care facilities assets of approximately $992 million and $515 million as of March 31, 2017 and 2016, respectively.