Commitments and Contingencies - Additional Information (Detail) £ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 GBP (£)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2022 GBP (£)	Jun. 01, 2020 USD ($)	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	$ 496,416,000		$ 463,678,000	$ 368,964,000							$ 322,824,000
Self-insured for professional and general liability, current	74,000,000		74,000,000
Compensation liability claims	125,000,000		115,000,000
Compensation and related benefits	55,000,000		55,000,000
Impact of information technology incident on revenue	13,000,000		45,000,000
Proceeds from commercial cyber insurance	41,000,000		41,000,000
Revenues reserved				17,000,000
Combined estimated future purchase obligations	369,000,000
Defined benefit pension plan estimated payments through 2089	146,000,000
Other retirement plan liabilities	23,000,000
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
Construction Commitment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	24,000,000
Revenue Cycle Data Processing Services
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	54,000,000
Electronic Health Records And Revenue Cycle Application
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	224,000,000
Other Software Applications
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	16,000,000
Related to Certain Equipment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	169,000,000
Commercial Health Insurer and Self-insured Employee Benefit Plans
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	135,000,000
Healthcare Infrastructure
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations	75,000,000
Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible										$ 2,500,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £		£ 1,500
Maximum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses	$ 1,000,000,000
Percentage of insurance deductible	5.00%								5.00%
Maximum | Earthquake | CALIFORNIA
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses	$ 150,000,000
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 | Faulty Zones of UNITED STATES
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 | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible	3.00%								3.00%
Professional Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability			20,000,000
General Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability	$ 3,000,000
General And Professional Liability Insurance Policies
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability	16,000,000		52,000,000	25,000,000
General And Professional Liability Insurance Policies | Maximum
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence	162,500,000
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability	371,900,000		348,693,000	263,779,000							241,820,000
Subsidiaries | Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence				2,500,000
Purchased several excess policies through commercial insurance carriers per occurrence excess claim amount				10,000,000
Subsidiaries | Professional Liability | Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability | £									£ 16
Subsidiaries | Professional Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability	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
Subsidiaries | General And Professional Liability Insurance Policies | Maximum
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence			$ 155,000,000	$ 250,000,000	$ 250,000,000	$ 250,000,000					$ 250,000,000	$ 250,000,000	$ 250,000,000	$ 250,000,000