Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net revenues		$ 3,548,138	$ 3,323,407	$ 7,015,656	$ 6,616,363
Total assets		13,732,309	13,296,103	13,732,309	13,296,103	$ 13,494,188
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,542,194	1,433,920	3,032,683	2,800,387
Total assets	[1]	7,365,545	7,251,966	7,365,545	7,251,966
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		190,000	173,000	358,000	349,000
Total assets		$ 1,295,000	$ 1,220,000	$ 1,295,000	$ 1,220,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $190 million and $173 million for the three-month periods ended June 30, 2023 and 2022, respectively, and approximately $358 million and $349 million for the six-month periods ended June 30, 2023 and 2022, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.295 billion and $1.220 billion as of June 30, 2023 and 2022, respectively.