Real Estate Activities - 2019 Activity - Additional Information (Detail) € in Millions, £ in Millions, SFr in Millions, $ in Millions																12 Months Ended
	Dec. 29, 2020 CHF (SFr)	Dec. 17, 2020 USD ($) Hospital	Nov. 25, 2020 GBP (£)	Dec. 17, 2019 USD ($) Hospital RenewalOption Lease	Dec. 03, 2019 EUR (€) Hospital	Nov. 28, 2019 EUR (€)	Aug. 30, 2019 USD ($) RenewalOption	Aug. 23, 2019 USD ($) Hospital RenewalOption Health_Center	Aug. 16, 2019 GBP (£) Hospital	Jun. 28, 2019 CHF (SFr)	Jun. 10, 2019 USD ($) Hospital RenewalOption	Jun. 06, 2019 AUD ($) Hospital	May 27, 2019 CHF (SFr) _Campus	Apr. 12, 2019 Hospital	Aug. 28, 2018 EUR (€) Hospital	Dec. 31, 2020 USD ($) Hospital	Dec. 31, 2019 USD ($) Hospital	Aug. 31, 2018
Business Acquisition [Line Items]
Term of lease																15 years
Term of lease extension, years																5 years
Mortgage loan balance | $																$ 1,106,448,000	$ 1,819,854,000
Weighted average remaining lease term																41 years 1 month 6 days	31 years 10 months 24 days
Other Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $																	$ 135,000,000
Ramsay Health Care [Member]
Business Acquisition [Line Items]
Lease term ending period									2037
Infracore SA [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr	SFr 206.5
Swiss Medical Network [Member]
Business Acquisition [Line Items]
Weighted average remaining lease term													23 years
Aevis Victoria SA [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr										SFr 47.0
Ownership interest in joint venture under the cost method										4.90%
Vibra [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $							$ 254,000,000
Term of lease							20 years
Number of lease extension options | RenewalOption							3
Lease extension options, description																three five-year extension options
Existence of option to extend							true
Term of lease extension, years							5 years
Switzerland [Member] | Infracore SA [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr													SFr 236.6
Spain [Member] | Spanish PropCo. [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method					45.00%
Prospect [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $								$ 1,550,000,000
Term of lease								15 years
Number of lease extension options | RenewalOption								3
Existence of option to extend								true
Term loan | $								$ 112,900,000
Additional number of businesses acquired								2
Future purchase price adjustment | $								$ 250,000,000.0
Performance thresholds achievement period								3 years
Prospect [Member] | Investment in Financing Leases [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $								$ 1,400,000,000
Secure Income REIT [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | £									£ 347
Secure Income REIT [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Number of private hospitals acquired									8
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired				10												2
Purchase price of acquisition | $				$ 700,000,000.0
Acute Care Hospital [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Number of facilities acquired																	3
Acute Care Hospital [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | £			£ 50
Acute Care Hospital [Member] | Spain [Member]
Business Acquisition [Line Items]
Number of facilities acquired					2
Purchase price of acquisition | €					€ 117.3
Acute Care Hospital [Member] | Portugal [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | €						€ 28.2
Acute Care Hospital [Member] | Texas [Member] | Steward [Member]
Business Acquisition [Line Items]
Number of facilities acquired														1
Acute Care Hospital [Member] | Germany [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method																		50.00%
Acute Care Hospital [Member] | Poole, England [Member] | Circle [Member]
Business Acquisition [Line Items]
Number of facilities acquired																	1
Acute Care Hospital [Member] | California [Member] | Halsen Healthcare [Member]
Business Acquisition [Line Items]
Number of facilities acquired																	1
Acute Care Hospital [Member] | Prospect [Member] | Mortgage Loans [Member]
Business Acquisition [Line Items]
Mortgage loan balance | $								$ 51,300,000
Life Point [Member]
Business Acquisition [Line Items]
Number of master leases | Lease				1
Term of lease				20 years
Number of lease extension options | RenewalOption				2
Lease extension options, description																two five-year extension options
Existence of option to extend				true
Term of lease extension, years				5 years
Acute Care Campus [Member] | Switzerland [Member] | Infracore SA [Member]
Business Acquisition [Line Items]
Number of facilities acquired | _Campus													13
Acute Care Campus [Member] | Prospect [Member]
Business Acquisition [Line Items]
Number of facilities acquired								14
Acute Care Campus [Member] | Prospect [Member] | Investment in Financing Leases [Member]
Business Acquisition [Line Items]
Number of facilities acquired								11
Behavioral Health Care Facility [Member] | Prospect [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Health_Center								2
Behavioral Health Care Facility [Member] | Prospect [Member] | Investment in Financing Leases [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Health_Center								2
Hospital [Member] | Healthscope [Member]
Business Acquisition [Line Items]
Term of lease												20 years
Hospital [Member] | Australia [Member]
Business Acquisition [Line Items]
Number of facilities acquired												11
Purchase price of acquisition | $												$ 1,200.0
Stamp duties and registration fees | $												$ 66.6
Additional Properties [Member] | Switzerland [Member] | Infracore SA [Member]
Business Acquisition [Line Items]
Number of facilities acquired | _Campus													2
HM Hospital [Member] | Spain [Member]
Business Acquisition [Line Items]
Term of lease					25 years
Jose de Mello [Member] | Portugal [Member]
Business Acquisition [Line Items]
Term of lease						17 years
Inpatient Rehabilitation Hospital [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $		$ 58,000,000
Inpatient Rehabilitation Hospital [Member] | Texas [Member]
Business Acquisition [Line Items]
Number of facilities acquired		1
Inpatient Rehabilitation Hospital [Member] | Germany [Member]
Business Acquisition [Line Items]
Number of facilities acquired															3
Purchase price of acquisition | €															€ 17.3
Inpatient Rehabilitation Hospital [Member] | Germany [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Number of facilities acquired																	1
Community Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired											7
Number of lease extension options | RenewalOption											2
Lease extension options, description																two five-year extension options
Existence of option to extend											true
Term of lease extension, years											5 years
Leases fixed escalations											5 years
Community Hospital [Member] | Saint Luke's Health System [Member]
Business Acquisition [Line Items]
Term of lease											14 years
Community Hospital [Member] | Kansas [Member]
Business Acquisition [Line Items]
Number of facilities acquired											7
Purchase price of acquisition | $											$ 145,400,000