Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net revenues		$ 3,467,518	$ 3,292,956
Total assets		13,555,959	13,144,446	$ 13,494,188
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,490,489	1,366,467
Total assets	[1]	7,343,276	7,260,870
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		168,000	176,000
Total assets		$ 1,265,000	$ 1,320,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $168 million and $176 million for the three-month periods ended March 31, 2023 and 2022, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.265 billion and $1.320 billion as of March 31, 2023 and 2022, respectively.