Schedule of Disaggregates Revenue by Major Source (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Net revenues		$ 14,281,976		$ 13,399,370	$ 12,642,117
Percentage of Net Revenue		100.00%		100.00%	100.00%
Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,607,405		$ 1,615,762	$ 1,654,119
Percentage of Net Revenue		11.00%		12.00%	13.00%
Managed Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,714,055		$ 1,560,589	$ 1,362,962
Percentage of Net Revenue		12.00%		12.00%	11.00%
Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,532,904		$ 1,512,396	$ 1,291,692
Percentage of Net Revenue		11.00%		11.00%	10.00%
Managed Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 2,290,661		$ 2,206,855	$ 1,947,263
Percentage of Net Revenue		16.00%		16.00%	15.00%
Managed Care (HMO and PPOs)
Disaggregation Of Revenue [Line Items]
Net revenues		$ 4,211,194		$ 4,012,954	$ 3,957,027
Percentage of Net Revenue		29.00%		30.00%	31.00%
UK Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 761,124		$ 684,594	$ 687,725
Percentage of Net Revenue		5.00%		5.00%	5.00%
Other Patient Revenue and Adjustments, Net
Disaggregation Of Revenue [Line Items]
Net revenues		$ 981,203		$ 745,642	$ 843,200
Percentage of Net Revenue		7.00%		6.00%	7.00%
Other Non-patient Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,183,430		$ 1,060,578	$ 898,129
Percentage of Net Revenue		8.00%		8.00%	7.00%
Acute Care Hospital Services
Disaggregation Of Revenue [Line Items]
Net revenues		$ 8,081,402	[1]	$ 7,646,749	$ 7,108,254
Percentage of Net Revenue		100.00%		100.00%	100.00%
Acute Care Hospital Services | Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,297,084		$ 1,289,425	$ 1,292,205
Percentage of Net Revenue		16.00%		17.00%	18.00%
Acute Care Hospital Services | Managed Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,368,284		$ 1,274,719	$ 1,118,901
Percentage of Net Revenue		17.00%		17.00%	16.00%
Acute Care Hospital Services | Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 638,986		$ 719,870	$ 539,741
Percentage of Net Revenue		8.00%		9.00%	8.00%
Acute Care Hospital Services | Managed Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 716,380		$ 757,488	$ 618,727
Percentage of Net Revenue		9.00%		10.00%	9.00%
Acute Care Hospital Services | Managed Care (HMO and PPOs)
Disaggregation Of Revenue [Line Items]
Net revenues		$ 2,658,890		$ 2,536,818	$ 2,521,089
Percentage of Net Revenue		33.00%		33.00%	35.00%
Acute Care Hospital Services | UK Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 0		$ 0	$ 0
Percentage of Net Revenue		0.00%		0.00%	0.00%
Acute Care Hospital Services | Other Patient Revenue and Adjustments, Net
Disaggregation Of Revenue [Line Items]
Net revenues		$ 452,781		$ 261,879	$ 358,458
Percentage of Net Revenue		6.00%		3.00%	5.00%
Acute Care Hospital Services | Other Non-patient Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 948,997		$ 806,550	$ 659,133
Percentage of Net Revenue		12.00%		11.00%	9.00%
Behavioral Health Services
Disaggregation Of Revenue [Line Items]
Net revenues	[2]	$ 6,190,921		$ 5,729,758	$ 5,503,644
Percentage of Net Revenue		100.00%		100.00%	100.00%
Behavioral Health Services | Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 310,321		$ 326,337	$ 361,914
Percentage of Net Revenue		5.00%		6.00%	7.00%
Behavioral Health Services | Managed Medicare
Disaggregation Of Revenue [Line Items]
Net revenues		$ 345,771		$ 285,870	$ 244,061
Percentage of Net Revenue		6.00%		5.00%	4.00%
Behavioral Health Services | Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 893,918		$ 792,526	$ 751,951
Percentage of Net Revenue		14.00%		14.00%	14.00%
Behavioral Health Services | Managed Medicaid
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,574,281		$ 1,449,367	$ 1,328,536
Percentage of Net Revenue		25.00%		25.00%	24.00%
Behavioral Health Services | Managed Care (HMO and PPOs)
Disaggregation Of Revenue [Line Items]
Net revenues		$ 1,552,304		$ 1,476,136	$ 1,435,938
Percentage of Net Revenue		25.00%		26.00%	26.00%
Behavioral Health Services | UK Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 761,124		$ 684,594	$ 687,725
Percentage of Net Revenue		12.00%		12.00%	12.00%
Behavioral Health Services | Other Patient Revenue and Adjustments, Net
Disaggregation Of Revenue [Line Items]
Net revenues		$ 528,422		$ 483,763	$ 484,742
Percentage of Net Revenue		9.00%		8.00%	9.00%
Behavioral Health Services | Other Non-patient Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 224,780		$ 231,165	$ 208,777
Percentage of Net Revenue		4.00%		4.00%	4.00%
Other
Disaggregation Of Revenue [Line Items]
Net revenues		$ 9,653		$ 22,863	$ 30,219
Other | Other Non-patient Revenue
Disaggregation Of Revenue [Line Items]
Net revenues		$ 9,653		$ 22,863	$ 30,219

[1] Included in our 2022 acute care hospital services operating segment income (loss) before allocation of corporate overhead and income taxes is a pre-tax $58 million provision for asset impairment charge to reduce the carrying value of real property assets.

[2] Includes net revenues generated from our behavioral health care facilities located in the U.K. amounting to approximately $761 million in 2023, $685 million in 2022 and $688 million in 2021. Total assets at our U.K. behavioral health care facilities were approximately $1.327 billion as of December 31, 2023, $1.235 billion as of December 31, 2022 and $1.351 billion as of December 31, 2021.