Commitments and Contingencies - Additional Information (Detail) £ in Millions	1 Months Ended	12 Months Ended									69 Months Ended
	Jul. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2019 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		$ 322,824,000		$ 314,941,000	$ 298,222,000						$ 322,824,000			$ 274,815,000
Self-insured for professional and general liability, current		42,000,000		42,000,000	54,000,000						42,000,000
Compensation liability claims		81,000,000		72,000,000	70,000,000						81,000,000
Compensation and related benefits		40,000,000		40,000,000	35,000,000						40,000,000
Combined estimated future purchase obligations		293,000,000									293,000,000
Defined benefit pension plan estimated payments through 2089		169,000,000									169,000,000
Other retirement plan liabilities		20,000,000									20,000,000
Department of Human Services
Commitments and Contingencies Disclosure [Line Items]
Repayment of legal settlement amount on demand						$ 4,000,000	$ 4,000,000	$ 4,000,000	$ 4,000,000	$ 4,000,000
Amount claimed from over payments of legal settlements						5,000,000	7,000,000	7,000,000	4,000,000
Amount claimed from over payments of legal settlements due to change in calculations									$ 2,000,000
DOJ
Commitments and Contingencies Disclosure [Line Items]
Definitive settlement and related civil agreements	$ 127,000,000
Increase in aggregate pre-tax reserve		134,000,000		123,000,000
Pre-tax increase to reserve for civil aspects		11,000,000		102,000,000
DOJ | State and Local Jurisdiction
Commitments and Contingencies Disclosure [Line Items]
Provision for income tax related to non-deductible DOJ reserve		6,000,000
River Point Behavioral Health
Commitments and Contingencies Disclosure [Line Items]
Amount withheld in contingent Medicare payment suspension											8,600,000
Construction Commitment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		125,000,000									125,000,000
Revenue Cycle Data Processing Services
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		37,000,000									37,000,000
Electronic Health Records And Revenue Cycle Application
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		219,000,000									219,000,000
Other Software Applications
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		37,000,000									37,000,000
Related to Certain Equipment
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		189,000,000									189,000,000
Commercial Health Insurer and Self-insured Employee Benefit Plans
Commitments and Contingencies Disclosure [Line Items]
Combined estimated future purchase obligations		87,000,000									87,000,000
Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Minimum Insurance Deductible		50,000									50,000
Maximum insurance deductible		250,000									250,000
Flood
Commitments and Contingencies Disclosure [Line Items]
Maximum insurance deductible		500,000									500,000
Professional And General Liability
Commitments and Contingencies Disclosure [Line Items]
Increase in professional and general liability self-insurance reserves relating to prior years					15,000,000
Cygnet Health Care Limited
Commitments and Contingencies Disclosure [Line Items]
Property insurance | £			£ 1,290
Maximum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 1,000,000,000									$ 1,000,000,000
Percentage of insurance deductible		5.00%									5.00%		5.00%
Maximum | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 100,000,000									$ 100,000,000
Maximum | LAS VEGAS, NEVADA | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		500,000,000									500,000,000
Maximum | CALIFORNIA | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		130,000,000									130,000,000
Maximum | OTHER STATES | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		250,000,000									250,000,000
Maximum | Faulty Zones of UNITED STATES | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		100,000,000									100,000,000
Maximum | Texas | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		10,000,000									10,000,000
Maximum | PUERTO RICO | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		40,000,000									40,000,000
Maximum | PUERTO RICO | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 1,000,000									$ 1,000,000
Minimum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible		3.00%									3.00%		3.00%
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		$ 241,820,000		243,051,000	228,691,000						$ 241,820,000			207,459,000
Subsidiaries | Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		5,000,000		5,000,000	5,000,000						5,000,000
Subsidiaries | Professional Liability | Subsequent Event
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 | £													£ 10
Subsidiaries | Professional Liability | Maximum
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability														10,000,000
Subsidiaries | Professional Liability | Maximum | Subsequent Event
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability												10,000,000
Subsidiaries | General Liability
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
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
Subsidiaries | General Liability | Maximum | Subsequent Event
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability												$ 3,000,000
Subsidiaries | General And Professional Liability Insurance Policies
Commitments and Contingencies Disclosure [Line Items]
Percentage of liability for claims paid under commercially insured coverage		10.00%									10.00%		10.00%
Subsidiaries | General And Professional Liability Insurance Policies | Maximum
Commitments and Contingencies Disclosure [Line Items]
Purchased several excess policies through commercial insurance carriers per occurrence						$ 250,000,000	$ 250,000,000	$ 200,000,000						$ 250,000,000
Liability for claims paid under commercially insured coverage		$ 5,000,000									$ 5,000,000
Subsidiaries | General And Professional Liability Insurance Policies | Maximum | Located in U.K.
Commitments and Contingencies Disclosure [Line Items]
Liability for claims paid under commercially insured coverage		$ 8,500,000									$ 8,500,000