Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenues		$ 3,336,027	$ 3,155,999	$ 9,952,390	$ 9,366,866
Total assets		13,378,900	12,846,853	13,378,900	12,846,853	$ 13,093,543
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,434,828	1,328,293	4,235,215	4,075,127
Total assets	[1]	7,336,437	7,106,832	7,336,437	7,106,832
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		167,000	174,000	516,000	511,000
Total assets		$ 1,119,000	$ 1,338,000	$ 1,119,000	$ 1,338,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $167 million and $174 million for the three-month periods ended September 30, 2022 and 2021, respectively, and approximately $516 million and $511 million for the nine-month periods ended September 30, 2022 and 2021, respectively.  Total assets at our U.K. behavioral health care facilities were approximately $1.119 billion and $1.338 billion as of September 30, 2022 and 2021, respectively.