Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenues		$ 3,323,407	$ 3,197,880	$ 6,616,363	$ 6,210,867
Total assets		13,296,103	12,812,635	13,296,103	12,812,635	$ 13,093,543
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,433,920	1,431,497	2,800,387	2,746,834
Total assets	[1]	7,251,966	7,159,426	7,251,966	7,159,426
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		173,000	172,000	349,000	337,000
Total assets		$ 1,220,000	$ 1,369,000	$ 1,220,000	$ 1,369,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $173 million and $172 million for the three-month periods ended June 30, 2022 and 2021, respectively, and approximately $349 million and $337 million for the six-month periods ended June 30, 2022 and 2021, respectively.  Total assets at our U.K. behavioral health care facilities were approximately $1.220 billion and $1.369 billion as of June 30, 2022 and 2021, respectively.