Commitments and Contingencies - Additional Information (Detail) £ in Millions	1 Months Ended	3 Months Ended		12 Months Ended						72 Months Ended
	Jul. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 GBP (£)	Dec. 31, 2019 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 GBP (£)	Jan. 31, 2020 USD ($)	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, current		$ 42,000,000		$ 42,000,000						$ 42,000,000
Compensation liability claims		84,000,000		81,000,000						84,000,000
Compensation and related benefits		40,000,000		40,000,000						40,000,000
Accounts receivable, net		1,486,829,000		1,560,847,000						1,486,829,000
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					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
DOJ
Commitments and Contingencies Disclosure [Line Items]
Definitive settlement and related civil agreements	$ 127,000,000
Change in pre-tax reserve		0
Pre-tax reserve for civil aspects		134,000,000		134,000,000						134,000,000
DOJ | Federal and State Income Taxes
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										8,700,000
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
Illinois
Commitments and Contingencies Disclosure [Line Items]
Accounts receivable, net		23,000,000		36,000,000						23,000,000
Accounts receivable net greater than sixty days Past due		11,000,000		18,000,000						11,000,000
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 | 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 | 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
Maximum | OTHER STATES | Earthquake
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		250,000,000								250,000,000
Maximum | Texas | Flood
Commitments and Contingencies Disclosure [Line Items]
Commercial property insurance policies covering catastrophic losses		$ 10,000,000								$ 10,000,000
Minimum | Wind Storms
Commitments and Contingencies Disclosure [Line Items]
Percentage of insurance deductible		3.00%								3.00%	3.00%
General And Professional Liability Insurance Policies
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		$ 20,000,000
General and Professional Liability
Commitments and Contingencies Disclosure [Line Items]
Self-insured for professional and general liability		$ 261,000,000		242,000,000						$ 261,000,000
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
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			$ 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
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
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
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