Segment Reporting (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Gross inpatient revenues		$ 12,675,705	$ 11,592,749
Gross outpatient revenues		6,032,652	4,827,484
Total net revenues		3,292,956	3,012,987
Income/(loss) before allocation of corporate overhead and income taxes		199,983	272,877
Allocation of corporate overhead		0	0
Income before income taxes		199,983	272,877
Total assets		13,144,446	13,096,329	$ 13,093,543
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Gross inpatient revenues		10,239,231	9,119,184
Gross outpatient revenues		5,775,539	4,580,720
Total net revenues		1,912,316	1,694,542
Income/(loss) before allocation of corporate overhead and income taxes		148,680	173,118
Allocation of corporate overhead		(62,284)	(58,107)
Income before income taxes		86,396	115,011
Total assets		5,645,352	4,957,253
Behavioral Health Services
Segment Reporting Information [Line Items]
Gross inpatient revenues	[1]	2,436,474	2,473,565
Gross outpatient revenues	[1]	257,113	246,764
Total net revenues	[1]	1,366,467	1,315,337
Income/(loss) before allocation of corporate overhead and income taxes	[1]	205,787	231,325
Allocation of corporate overhead	[1]	(45,001)	(42,950)
Income before income taxes	[1]	160,786	188,375
Total assets	[1]	7,260,870	7,090,291
Other
Segment Reporting Information [Line Items]
Gross inpatient revenues			0
Gross outpatient revenues			0
Total net revenues		14,173	3,108
Income/(loss) before allocation of corporate overhead and income taxes		(154,484)	(131,566)
Allocation of corporate overhead		107,285	101,057
Income before income taxes		(47,199)	(30,509)
Total assets		$ 238,224	$ 1,048,785

[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.