Commitments and Contingencies - Additional Information (Detail) £ in Millions				12 Months Ended
	Oct. 10, 2024 USD ($)	Sep. 27, 2024 USD ($) Plaintiffs	Mar. 28, 2024 USD ($)	Dec. 31, 2024 USD ($) Facility	Dec. 31, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2024 GBP (£) Facility	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				$ 623,998,000		$ 561,789,000	$ 496,416,000						$ 463,678,000
Purchased several excess policies through commercial insurance carriers per occurrence excess claim amount				30,000,000
Self-insured for professional and general liability, current				85,000,000		70,000,000
Compensation liability claims				137,000,000		130,000,000
Compensation and related benefits				58,000,000		55,000,000
Maximum insurance deductible				5,000,000
Impact of information technology incident on revenue							13,000,000
Combined estimated future purchase obligations				436,000,000
Defined benefit pension plan estimated payments through 2089				133,000,000
Other retirement plan liabilities				$ 26,000,000
Pre-tax decrease to reserves for self-insured workers' compensation liability claims						10,000
Behavioral health care facilities with outside owners holding non-controlling minority interest | Facility				6								6
Behavioral health care facilities share of construction costs scheduled to be completed in 2025 | Facility				2								2
Self insurance reserve amount exhausted				$ 10,000,000
Purchased several excess policies through commercial insurance amount exhausted				30,000,000
District Facilities
Commitments and Contingencies Disclosure [Line Items]
Projected aggregate development and construction cost				439,000,000
Development and construction cost incurred				$ 344,000,000
Lease initial terms				75 years								75 years
Committment to expend				$ 14,000,000
Projected commitment expend period				12 years	12 years
The Pavilion Behavioral Health System
Commitments and Contingencies Disclosure [Line Items]
Aggregate insurance coverage				$ 221,000,000
Self-insured retention amounts				10,000,000
The Pavilion Behavioral Health System | Compensatory Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	$ 475,000,000		$ 60,000,000
The Pavilion Behavioral Health System | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	120,000,000		$ 475,000,000
Cumberland Hospital for Children and Adolescents
Commitments and Contingencies Disclosure [Line Items]
Number of plaintiffs | Plaintiffs		40
Self-insured retention amounts				10,000,000
Cumberland Hospital for Children and Adolescents | Compensatory Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded		$ 60,000,000
Cumberland Hospital for Children and Adolescents | Trebled Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded		180,000,000
Cumberland Hospital for Children and Adolescents | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded		$ 120,000,000
Cumberland Hospital for Children and Adolescents | Compensatory Damages, Trebled And Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Number of plaintiffs | Plaintiffs		3
Department of Human Services
Commitments and Contingencies Disclosure [Line Items]
Repayment of legal settlement amount on demand				4,000,000
Amount claimed from over payments of legal settlements								$ 7,000,000	$ 8,000,000	$ 7,000,000	$ 4,000,000
Amount claimed from over payments of legal settlements due to change in calculations								$ 3,000,000	2,000,000	$ 2,000,000
Revenue Cycle Data Processing Services
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				52,000,000
Electronic Health Records And Revenue Cycle Application
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				183,000,000
Other Software Applications
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				12,000,000
Estimated Construction Commitment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				32,000,000
Related to Certain Equipment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				159,000,000
Commercial Health Insurer and Self-insured Employee Benefit Plans
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				118,000,000
Healthcare Infrastructure
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				61,000,000
Enterprise Resource Planning Application
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				85,000,000
Administrative Software Applications
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations				43,000,000
All Other Events
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				5,000,000
Earthquake Wind Hail and Flood
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				5,000,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £					£ 1,500
Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				10,000,000
Purchased several excess policies through commercial insurance carriers per occurrence				25,000,000
Commercial property insurance policies covering catastrophic losses				$ 1,000,000,000
Lease initial terms				10 years								10 years
Maximum | The Pavilion Behavioral Health System | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	475,000,000
Maximum | Cumberland Hospital for Children and Adolescents | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded		$ 1,050,000.00
Maximum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible				5.00%								5.00%
Maximum | Earthquake | CALIFORNIA
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				$ 100,000,000
Maximum | Earthquake | OTHER STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				250,000,000
Maximum | Earthquake | Faulty Zones of UNITED STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				100,000,000
Maximum | Earthquake | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				40,000,000
Maximum | Earthquake | California, New Madrid Seismic Zone, Pacific Northwest Seismic Zone, Alaska and certain counties in Nevada
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				100,000,000
Maximum | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				100,000,000
Maximum | Flood | Texas
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				10,000,000
Maximum | Flood | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				1,000,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Loss on business interruption insurance recovery				$ 15,000,000
Lease initial terms				5 years								5 years
Minimum | District Facilities
Commitments and Contingencies Disclosure [Line Items]
Committment to expend				$ 75,000,000
Minimum | The Pavilion Behavioral Health System | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	$ 120,000,000
Minimum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible				3.00%								3.00%
Professional Liability | The Pavilion Behavioral Health System | Multi-Plaintiff Matters
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts				$ 25,000,000
Professional Liability | Cumberland Hospital for Children and Adolescents
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts				25,000,000
General Liability | The Pavilion Behavioral Health System
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts				3,000,000
General Liability | Cumberland Hospital for Children and Adolescents
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts				3,000,000
General And Professional Liability Insurance Policies
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				79,000,000		25,000,000	16,000,000
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				486,888,000		431,485,000	371,900,000						348,693,000
Subsidiaries | Professional Liability | Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability | £												£ 20
Subsidiaries | Professional Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				20,000,000		20,000,000	20,000,000						20,000,000	$ 10,000,000	$ 5,000,000	$ 5,000,000	$ 5,000,000	$ 10,000,000
Subsidiaries | General Liability | Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability | £												£ 25
Subsidiaries | General Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				3,000,000		3,000,000	3,000,000						3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000	$ 3,000,000
Subsidiaries | General And Professional Liability Insurance Policies | Maximum
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence				$ 175,000,000		$ 165,000,000	$ 162,000,000		$ 250,000,000				$ 155,000,000