Segment Reporting (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Gross inpatient revenues		$ 14,029,481	$ 12,675,705
Gross outpatient revenues		7,568,487	6,032,652
Revenue From Contract With Customer Excluding Assessed Tax		3,467,518	3,292,956
Income/(loss) before allocation of corporate overhead and income taxes		214,101	199,983
Allocation of corporate overhead		0	0
Income before income taxes		214,101	199,983
Total assets		13,555,959	13,144,446	$ 13,494,188
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Gross inpatient revenues		11,401,491	10,239,231
Gross outpatient revenues		7,296,116	5,775,539
Revenue From Contract With Customer Excluding Assessed Tax		1,973,532	1,912,316
Income/(loss) before allocation of corporate overhead and income taxes		133,296	148,680
Allocation of corporate overhead		(67,262)	(62,284)
Income before income taxes		66,034	86,396
Total assets		6,001,135	5,645,352
Behavioral Health Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	[1]	2,627,990	2,436,474
Gross outpatient revenues	[1]	272,371	257,113
Revenue From Contract With Customer Excluding Assessed Tax	[1]	1,490,489	1,366,467
Income/(loss) before allocation of corporate overhead and income taxes	[1]	266,356	205,787
Allocation of corporate overhead	[1]	(46,642)	(45,001)
Income before income taxes	[1]	219,714	160,786
Total assets	[1]	7,343,276	7,260,870
Other
Segment Reporting Information [Line Items]
Revenue From Contract With Customer Excluding Assessed Tax		3,497	14,173
Income/(loss) before allocation of corporate overhead and income taxes		(185,551)	(154,484)
Allocation of corporate overhead		113,904	107,285
Income before income taxes		(71,647)	(47,199)
Total assets		$ 211,548	$ 238,224

[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.