Commitments and Contingencies - Additional Information (Detail) $ in Millions, £ in Billions				12 Months Ended
	Jan. 06, 2020 USD ($)	Dec. 23, 2019 GBP (£) Hospital RenewalOption	Dec. 17, 2019 USD ($) Hospital	Dec. 31, 2019
Commitment And Contingencies [Line Items]
Term of lease extension, years				5 years
Acute Care Hospital [Member]
Commitment And Contingencies [Line Items]
Number of facilities acquired			10
Purchase price of acquisition | $			$ 700.0
Acute Care Hospital [Member] | England [Member] | BMI [Member]
Commitment And Contingencies [Line Items]
Number of facilities acquired		30
Purchase price of acquisition | £		£ 1.5
Number of leased properties		52
Initial fixed term of lease		2050
Existence of option to extend		true
Number of lease extension options | RenewalOption		2
Term of lease extension, years		5 years
Lease extension options, description				two five-year extension options
Acute Care Hospital [Member] | Term Loan [Member] | England [Member] | Subsequent Event [Member] | BMI [Member]
Commitment And Contingencies [Line Items]
Senior unsecured notes face amount | $	$ 700.0
Debt instrument term	5 years