Segment Reporting (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Gross inpatient revenues		$ 55,336,031		$ 50,121,236	$ 46,449,556
Gross outpatient revenues		30,946,469		25,845,088	21,647,468
Total net revenues		14,281,976		13,399,370	12,642,117
Income (loss) before allocation of corporate overhead and income taxes		940,426		866,260	1,293,313
Allocation of corporate overhead		0		0	0
Income before income taxes		940,426		866,260	1,293,313
Total assets		13,967,602		13,494,188	13,093,543
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Gross inpatient revenues		44,687,035	[1]	40,004,670	36,522,155
Gross outpatient revenues		29,858,874	[1]	24,813,718	20,633,921
Total net revenues		8,081,402	[1]	7,646,749	7,108,254
Income (loss) before allocation of corporate overhead and income taxes		540,345	[1]	429,664	734,666
Allocation of corporate overhead		(266,413)	[1]	(252,034)	(233,298)
Income before income taxes		273,932	[1]	177,630	501,368
Total assets		6,201,235	[1]	5,993,887	5,534,912
Behavioral Health Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	[2]	10,648,996		10,116,566	9,927,401
Gross outpatient revenues	[2]	1,087,595		1,031,370	1,013,547
Total net revenues	[2]	6,190,921		5,729,758	5,503,644
Income (loss) before allocation of corporate overhead and income taxes	[2]	1,083,680		980,290	1,025,557
Allocation of corporate overhead	[2]	(186,662)		(179,936)	(172,512)
Income before income taxes	[2]	897,018		800,354	853,045
Total assets	[2]	7,526,672		7,277,293	7,250,427
Other
Segment Reporting Information [Line Items]
Total net revenues		9,653		22,863	30,219
Income (loss) before allocation of corporate overhead and income taxes		(683,599)		(543,694)	(466,910)
Allocation of corporate overhead		453,075		431,970	405,810
Income before income taxes		(230,524)		(111,724)	(61,100)
Total assets		$ 239,695		$ 223,008	$ 308,204

[1] Included in our 2022 acute care hospital services operating segment income (loss) before allocation of corporate overhead and income taxes is a pre-tax $58 million provision for asset impairment charge to reduce the carrying value of real property assets.

[2] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $761 million in 2023, $685 million in 2022 and $688 million in 2021. Total assets at our U.K. behavioral health care facilities were approximately $1.327 billion as of December 31, 2023, $1.235 billion as of December 31, 2022 and $1.351 billion as of December 31, 2021.