Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net revenues		$ 3,292,956	$ 3,012,987
Total assets		13,144,446	13,096,329	$ 13,093,543
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	1,366,467	1,315,337
Total assets	[1]	7,260,870	7,090,291
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		176,000	165,000
Total assets		$ 1,320,000	$ 1,355,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $176 million and $165 million for the three-month periods ended March 31, 2022 and 2021, respectively. Total assets at our U.K. behavioral health care facilities were approximately $1.320 billion and $1.355 billion as of March 31, 2022 and 2021, respectively.