Real Estate Activities - 2020 Activity - Additional Information (Detail) $ in Thousands, € in Millions, £ in Millions, SFr in Millions													12 Months Ended
	Dec. 29, 2020 CHF (SFr)	Dec. 18, 2020 GBP (£) Hospital	Dec. 17, 2020 USD ($) Hospital	Nov. 25, 2020 GBP (£)	Nov. 17, 2020 USD ($) Hospital	Aug. 13, 2020 USD ($)	Aug. 07, 2020 GBP (£) Hospital	Aug. 05, 2020 EUR (€)	Jul. 08, 2020 USD ($) Hospital	Jun. 16, 2020 RenewalOption	Jan. 08, 2020 GBP (£) Hospital	Dec. 17, 2019 USD ($) Hospital	Dec. 31, 2020 USD ($) Facility Hospital	Jun. 24, 2020 CHF (SFr)	May 13, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Term of lease extension, years													5 years
Acquisition loan | $													$ 4,249,180			$ 4,565,594	$ 1,430,995
Term of lease													15 years
Joint Venture Partner [Member]
Business Acquisition [Line Items]
Ownership interest															49.00%
Joint Venture Partner [Member] | Other Loans [Member]
Business Acquisition [Line Items]
Acquisition loan | $															$ 205,000
Steward [Member]
Business Acquisition [Line Items]
Initial fixed term of lease									2031-10
Infracore SA [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr	SFr 206.5
Secured loan | SFr														SFr 45.0
South Carolina [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $													$ 17,000
Net investment in lease | $													$ 115,000
Investment in number of facilities | Facility													5
Initial term													2037-12
Utah [Member] | Steward [Member]
Business Acquisition [Line Items]
Number of facilities acquired									2
Purchase price of acquisition | $									$ 200,000
Utah [Member] | Steward [Member] | Davis and Jordan Valley Facilities [Member]
Business Acquisition [Line Items]
Net investment in lease | $									$ 950,000
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired												10	2
Purchase price of acquisition | $												$ 700,000
Acute Care Hospital [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | £				£ 50.0
Lessor operating lease ground lease term				999 years
Acute Care Hospital [Member] | United Kingdom [Member] | BMI [Member]
Business Acquisition [Line Items]
Number of facilities acquired											30
Purchase price of acquisition | £											£ 1,500.0
Unearned rent revenue | £											£ 27.6
Number of leased properties											52
Initial fixed term of lease											2050
Existence of option to extend										true	false
Number of lease extension options | RenewalOption										2
Term of lease extension, years										5 years
Lease extension options, description													two five-year renewal options
Acute Care Hospital [Member] | South Carolina [Member]
Business Acquisition [Line Items]
Number of facilities acquired													1
Acute Care Hospital [Member] | Colombia [Member]
Business Acquisition [Line Items]
Number of facilities acquired					3
Purchase price of acquisition | $					$ 135,000
Acute Care Hospital [Member] | California [Member] | Prime Healthcare Services [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $						$ 300,000
Initial fixed term of lease						2035-08
Acute Care Hospital [Member] | Darlington, United Kingdom [Member]
Business Acquisition [Line Items]
Number of facilities acquired							1
Purchase price of acquisition | £							£ 29.4
Inpatient Rehabilitation Hospital [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $			$ 58,000
Inpatient Rehabilitation Hospital [Member] | South Carolina [Member]
Business Acquisition [Line Items]
Number of facilities acquired													3
Inpatient Rehabilitation Hospital [Member] | Dahlen, Germany [Member]
Business Acquisition [Line Items]
Number of facilities acquired													3
Purchase price of acquisition | €								€ 12.5
Inpatient Rehabilitation Hospital [Member] | Texas [Member]
Business Acquisition [Line Items]
Number of facilities acquired			1
Inpatient Rehabilitation Hospital [Member] | Indiana [Member]
Business Acquisition [Line Items]
Number of facilities acquired			1
Private Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired		1
Private Acute Care Hospital [Member] | Reading, United Kingdom [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | £		£ 85.0
Inpatient Rehabilitation Hospital, Acute Care Hospital and Private Acute Care Hospital [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $													$ 300,000