Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net revenues		$ 2,729,754	$ 2,855,168	$ 5,559,421	$ 5,659,559
Total assets		12,148,499	11,752,650	12,148,499	11,752,650	$ 11,668,250
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,259,123	1,320,241	2,565,232	2,606,624
Total assets	[1]	6,819,694	6,933,825	6,819,694	6,933,825
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		136,000	273,000	144,000	281,000
Total assets		$ 1,192,000	$ 1,217,000	$ 1,192,000	$ 1,217,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $136 million and $144 million for the three-month periods ended June 30, 2020 and 2019, respectively, and approximately $273 million and $281 million for the six-month periods ended June 30, 2020 and 2019, respectively.  Total assets at our U.K. behavioral health care facilities were approximately $1.192 billion and $1.217 billion as of June 30, 2020 and 2019, respectively.