Segment Reporting (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total net revenues		$ 4,099,720	$ 3,843,582
Salaries, wages and benefits		1,951,104	1,842,624
Other segment item operating expenses		1,105,752	1,032,170
Depreciation and amortization expense		148,345	141,003
Other (income) expense, net		(5,659)	(150)
Reportable segment income before income taxes		420,428	336,086
Interest expense, net		40,056	52,826
Operating Segments
Segment Reporting Information [Line Items]
Total net revenues		4,096,878	3,841,148
Material Reconciling Items
Segment Reporting Information [Line Items]
Total net revenues		2,842	2,434
Reportable segment income before income taxes		598,216	525,406
Corporate Nonsegment
Segment Reporting Information [Line Items]
Total net revenues		2,842	2,434
Other segment item operating expenses	[1]	140,478	141,363
Other (income) expense, net		3,433	(108)
Reportable segment income before income taxes		420,428	336,086
Interest expense, net		36,719	50,499
Acute Care Hospital Services
Segment Reporting Information [Line Items]
Total net revenues		2,349,229	2,185,081
Acute Care Hospital Services | Operating Segments
Segment Reporting Information [Line Items]
Total net revenues		2,349,229	2,185,081
Acute Care Hospital Services | Material Reconciling Items
Segment Reporting Information [Line Items]
Salaries, wages and benefits		910,724	861,547
Other segment item operating expenses	[2]	1,089,072	1,025,820
Depreciation and amortization expense		94,647	90,312
Interest (income) expense, net		2,262	1,300
Other (income) expense, net		(8,267)	634
Reportable segment income before income taxes		260,791	205,468
Behavioral Health Services
Segment Reporting Information [Line Items]
Total net revenues		1,747,649	1,656,067
Behavioral Health Services | Operating Segments
Segment Reporting Information [Line Items]
Total net revenues	[3]	1,747,649	1,656,067
Behavioral Health Services | Material Reconciling Items
Segment Reporting Information [Line Items]
Salaries, wages and benefits	[3]	928,166	872,196
Other segment item operating expenses	[2],[3]	430,400	415,710
Depreciation and amortization expense	[3]	51,408	47,872
Interest (income) expense, net	[3]	1,075	1,027
Other (income) expense, net	[3]	(825)	(676)
Reportable segment income before income taxes	[3]	337,425	319,938
Other
Segment Reporting Information [Line Items]
Total net revenues		$ 2,842	$ 2,434

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

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

[3] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $227 million and $208 million for the three-month periods ended March 31, 2025 and 2024, respectively.