Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net revenues		$ 3,907,604	$ 3,548,138	$ 7,751,186	$ 7,015,656
Total assets		14,071,428	13,732,309	14,071,428	13,732,309	$ 13,967,602
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,731,309	1,542,194	3,387,376	3,032,683
Total assets	[1]	7,572,228	7,365,545	7,572,228	7,365,545
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		213,000	190,000	421,000	358,000
Total assets		$ 1,360,000	$ 1,295,000	$ 1,360,000	$ 1,295,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $213 million and $190 million for the three-month periods ended June 30, 2024 and 2023, respectively, and approximately $421 million and $358 million for the six-month periods ended June 30, 2024 and 2023, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.36 billion and $1.295 billion as of June 30, 2024 and 2023, respectively.