Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net revenues		$ 3,843,582	$ 3,467,518
Total assets		14,046,132	13,555,959	$ 13,967,602
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,656,067	1,490,489
Total assets	[1]	7,534,702	7,343,276
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		208,000	168,000
Total assets		$ 1,336,000	$ 1,265,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $208 million and $168 million for the three-month periods ended March 31, 2024 and 2023, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.336 billion and $1.265 billion as of March 31, 2024 and 2023, respectively.