Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenues		$ 14,281,976	$ 13,399,370	$ 12,642,117
Total assets		13,967,602	13,494,188	13,093,543
Provision for asset impairment		0	57,550	14,391
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	6,190,921	5,729,758	5,503,644
Total assets	[1]	7,526,672	7,277,293	7,250,427
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		761,000	685,000	688,000
Total assets		$ 1,327,000	1,235,000	$ 1,351,000
Trade Names | Real Property Assets | Behavioral Health Services
Segment Reporting Information [Line Items]
Provision for asset impairment			$ 58

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $761 million in 2023, $685 million in 2022 and $688 million in 2021. Total assets at our U.K. behavioral health care facilities were approximately $1.327 billion as of December 31, 2023, $1.235 billion as of December 31, 2022 and $1.351 billion as of December 31, 2021.