Segment Reporting (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Gross inpatient revenues		$ 15,664,786	$ 14,029,481
Gross outpatient revenues		8,624,817	7,568,487
Total net revenues		3,843,582	3,467,518
Income/(loss) before allocation of corporate overhead and income taxes		336,086	214,101
Allocation of corporate overhead		0	0
Income before income taxes		336,086	214,101
Total assets		14,046,132	13,555,959	$ 13,967,602
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Gross inpatient revenues		12,910,102	11,401,491
Gross outpatient revenues		8,346,289	7,296,116
Total net revenues		2,185,081	1,973,532
Income/(loss) before allocation of corporate overhead and income taxes		205,468	133,296
Allocation of corporate overhead		(64,846)	(67,262)
Income before income taxes		140,622	66,034
Total assets		6,336,429	6,001,135
Behavioral Health Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	[1]	2,754,684	2,627,990
Gross outpatient revenues	[1]	278,528	272,371
Total net revenues	[1]	1,656,067	1,490,489
Income/(loss) before allocation of corporate overhead and income taxes	[1]	319,938	266,356
Allocation of corporate overhead	[1]	(46,935)	(46,642)
Income before income taxes	[1]	273,003	219,714
Total assets	[1]	7,534,702	7,343,276
Other
Segment Reporting Information [Line Items]
Total net revenues		2,434	3,497
Income/(loss) before allocation of corporate overhead and income taxes		(189,320)	(185,551)
Allocation of corporate overhead		111,781	113,904
Income before income taxes		(77,539)	(71,647)
Total assets		$ 175,001	$ 211,548

[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.