Commitments and Contingencies - Additional Information (Detail) £ in Millions				3 Months Ended			12 Months Ended
	Oct. 10, 2024 USD ($)	Sep. 27, 2024 USD ($) Plaintiffs	Mar. 28, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 GBP (£)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Mar. 31, 2025 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial reinsurance carriers per occurrence excess claim amount				$ 30,000,000
Self-insured for professional and general liability, current				85,000,000			$ 85,000,000
Compensation liability claims				145,000,000			137,000,000
Compensation and related benefits				58,000,000			58,000,000
Maximum insurance deductible				5,000,000
Self insurance reserve amount exhausted				10,000,000
Purchased several excess policies through commercial reinsurance 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				$ 380,000,000
Lease initial terms				75 years				75 years
Committment to expend				$ 15,000,000
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
Punitive damage amount, per plaintiff		$ 350,000
Cumberland Hospital for Children and Adolescents | Compensatory Damages, Trebled Damages And Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Number of plaintiffs | Plaintiffs		3
Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				250,000,000
Flood | 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				50,000,000
Earthquake Wind Hail and Flood
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				5,000,000
All Other Events
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible				5,000,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £					£ 2,300
Property insurance per occurrence | £					£ 150
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 | 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 | OTHER STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				250,000,000
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 | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				1,000,000
Maximum | Flood | Texas
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses				$ 10,000,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Lease initial terms				5 years				5 years
Loss on business interruption insurance recovery				$ 15,000,000
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
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability				506,000,000			487,000,000
Self-insured for professional and general liability						$ 7,000,000	79,000,000
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	$ 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	$ 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				$ 110,000,000			$ 175,000,000		$ 165,000,000	$ 162,000,000	$ 155,000,000						$ 250,000,000