Segment Reporting (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total net revenues		$ 15,827,935	$ 14,281,976	$ 13,399,370
Salaries, wages and benefits		7,518,687	7,107,484	6,762,256
Other segment item operating expenses		4,308,384	3,757,216	3,445,733
Depreciation and amortization expense		584,831	568,041	581,861
Other (income) expense, net		(2,231)	28,281	10,406
Reportable segment income before income taxes		1,497,936	940,426	866,260
Interest expense, net		186,109	206,674	126,889
Operating Segments
Segment Reporting Information [Line Items]
Total net revenues		15,817,378	14,272,323	13,376,507
Material Reconciling Items
Segment Reporting Information [Line Items]
Total net revenues		10,557	9,653	22,863
Reportable segment income before income taxes		2,195,670	1,624,025	1,409,954
Corporate Nonsegment
Segment Reporting Information [Line Items]
Total net revenues		10,557	9,653	22,863
Other segment item operating expenses	[1]	529,927	463,871	431,639
Other (income) expense, net		2,621	24,764	14,461
Reportable segment income before income taxes		1,497,936	940,426	866,260
Interest expense, net		175,743	204,617	120,457
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Total net revenues		8,922,327	8,081,402	7,646,749
Acute Care Hospital Services | Operating Segments
Segment Reporting Information [Line Items]
Total net revenues		8,922,327	8,081,402	7,646,749	[2]
Acute Care Hospital Services | Material Reconciling Items
Segment Reporting Information [Line Items]
Salaries, wages and benefits		3,511,359	3,406,060	3,332,535	[2]
Other segment item operating expenses	[3]	4,202,491	3,762,066	3,497,538	[2]
Depreciation and amortization expense		368,096	367,644	383,115	[2]
Interest (income) expense, net		6,339	(2,501)	1,109	[2]
Other (income) expense, net		(1,305)	7,788	2,788	[2]
Reportable segment income before income taxes		835,347	540,345	429,664	[2]
Behavioral Health Services
Segment Reporting Information [Line Items]
Total net revenues		6,895,051	6,190,921	5,729,758
Behavioral Health Services | Operating Segments
Segment Reporting Information [Line Items]
Total net revenues	[4]	6,895,051	6,190,921	5,729,758
Behavioral Health Services | Material Reconciling Items
Segment Reporting Information [Line Items]
Salaries, wages and benefits	[4]	3,603,123	3,353,008	3,107,216
Other segment item operating expenses	[3],[4]	1,724,763	1,564,649	1,457,217
Depreciation and amortization expense	[4]	206,362	189,297	186,555
Interest (income) expense, net	[4]	4,027	4,558	5,323
Other (income) expense, net	[4]	(3,547)	(4,271)	(6,843)
Reportable segment income before income taxes	[4]	1,360,323	1,083,680	980,290
Other
Segment Reporting Information [Line Items]
Total net revenues		$ 10,557	$ 9,653	$ 22,863

[1] Non-segment operating expenses for each period includes salaries, wages and benefits, other operating expenses, supplies expense and lease and rental expense.

[2] Included in our 2022 acute care hospital services reportable segment income before income taxes is a pre-tax $58 million provision for asset impairment charge to reduce the carrying value of real property assets.

[3] Other segment operating expenses for each period includes other operating expenses, supplies expense and lease and rental expense.

[4] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $880 million in 2024, $761 million in 2023 and $685 million in 2022.