Commitments and Contingencies - Additional Information (Detail) £ in Millions		3 Months Ended		6 Months Ended			12 Months Ended
	Mar. 28, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 GBP (£)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2024 GBP (£)	Dec. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence excess claim amount		$ 0		$ 0
Self-insured for professional and general liability, current		70,000,000		70,000,000								$ 70,000,000
Compensation liability claims		134,000,000		134,000,000								130,000,000
Pre-tax decrease to reserves for self-insured workers' compensation liability claims			$ 10,000,000			$ 10,000,000
Compensation and related benefits		58,000,000		58,000,000								55,000,000
Maximum insurance deductible		5,000,000		5,000,000
Plaintiff's counsel's fee demand				250,000
Self insurance reserve amount exhausted		0		0
Purchased several excess policies through commercial insurance amount exhausted		0		0
District Facilities
Commitments and Contingencies Disclosure [Line Items]
Projected aggregate development and construction cost		439,000,000		439,000,000
Development and construction cost incurred		$ 257,000,000		$ 257,000,000
Lease initial terms		75 years		75 years							75 years
Projected commitment expend period				12 years	12 years
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							$ 4,000,000	$ 7,000,000	$ 8,000,000	$ 7,000,000
Amount claimed from over payments of legal settlements due to change in calculations								$ 3,000,000	2,000,000	$ 2,000,000
The Pavilion Behavioral Health System
Commitments and Contingencies Disclosure [Line Items]
Aggregate insurance coverage		$ 221,000,000		221,000,000
The Pavilion Behavioral Health System | Compensatory Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	$ 60,000,000
The Pavilion Behavioral Health System | Punitive Damages
Commitments and Contingencies Disclosure [Line Items]
Damages awarded	$ 475,000,000
Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		250,000,000		250,000,000
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		50,000,000		50,000,000
Earthquake Wind Hail and Flood
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible		5,000,000		5,000,000
All Other Events
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible		5,000,000		5,000,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £					£ 1,500.0
Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		0		0
Purchased several excess policies through commercial insurance carriers per occurrence		25,000,000		25,000,000
Commercial property insurance policies covering catastrophic losses		$ 1,000,000,000		$ 1,000,000,000
Lease initial terms		10 years		10 years							10 years
Maximum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible		5.00%		5.00%							5.00%
Maximum | Earthquake | CALIFORNIA
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 100,000,000		$ 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		100,000,000
Maximum | Earthquake | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		40,000,000		40,000,000
Maximum | Earthquake | OTHER STATES
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		250,000,000		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		100,000,000
Maximum | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		100,000,000		100,000,000
Maximum | Flood | PUERTO RICO
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		1,000,000		1,000,000
Maximum | Flood | Texas
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 10,000,000		$ 10,000,000
Minimum
Commitments and Contingencies Disclosure [Line Items]
Lease initial terms		5 years		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 | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible		3.00%		3.00%							3.00%
Professional Liability | The Pavilion Behavioral Health System
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts		$ 10,000,000		$ 10,000,000
General Liability | The Pavilion Behavioral Health System
Commitments and Contingencies Disclosure [Line Items]
Self-insured retention amounts		3,000,000		3,000,000
General And Professional Liability Insurance Policies
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		7,000,000	$ 20,000,000	14,000,000		$ 20,000,000
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		465,000,000		465,000,000								431,000,000
Subsidiaries | Professional Liability | Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability | £											£ 18.5
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 | £											£ 25.0
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		$ 175,000,000		$ 175,000,000			$ 162,000,000		$ 250,000,000			$ 165,000,000	$ 155,000,000