Segment Reporting (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net revenues		$ 12,642,117	$ 11,558,897	$ 11,378,259
Total assets		13,093,543	13,476,879	11,668,250
Provision for asset impairment		14,391	0	97,631
Behavioral Health Services
Segment Reporting Information [Line Items]
Net revenues	[1]	5,503,644	5,208,722	5,210,063
Total assets	[1]	7,250,427	7,044,617	6,910,790
Behavioral Health Services | Located in U.K.
Segment Reporting Information [Line Items]
Net revenues		688,000	584,000	554,000
Total assets		$ 1,351,000	1,334,000	$ 1,270,000
Trade Names | Real Property Assets | Behavioral Health Services
Segment Reporting Information [Line Items]
Provision for asset impairment			$ 98,000

[1] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $688 million in 2021, $584 million in 2020 and $554 million in 2019.  Total assets at our U.K. behavioral health care facilities were approximately $1.351 billion as of December 31, 2021, $1.334 billion as of December 31, 2020 and $1.270 billion as of December 31, 2019. In addition, included in our 2019 Behavioral Health Services operating segment Income (loss) before allocation of corporate overhead and income taxes is a pre-tax $98 million provision for asset impairment to reduce the carrying value of a tradename intangible asset and real property assets.