Real Estate and Other Activities - 2019 Activity - Additional Information (Detail) € in Millions, £ in Millions, SFr in Millions, $ in Millions																12 Months Ended
	Oct. 21, 2021 EUR (€)	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	Dec. 31, 2021 USD ($) Hospital	Dec. 31, 2019 USD ($) Hospital	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Term of lease																15 years
Term of lease extension, years																5 years
Mortgage loan balance | $																$ 1,541,864,000		$ 1,106,448,000
Weighted average remaining lease term																40 years 7 months 6 days		41 years 1 month 6 days
Other Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $																	$ 135,000,000
Infracore [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%					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 [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr														SFr 236.6
Spain [Member] | Spanish Prop Co. [Member]
Business Acquisition [Line Items]
Ownership interest						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
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 | Hospital										8
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital					10											2
Purchase price of acquisition | $					$ 700,000,000
Acute Care Hospital [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital																	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 | Hospital						2
Purchase price of acquisition | €						€ 117.3
Acute Care Hospital [Member] | Portugal [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | €	€ 17.8						€ 28.2
Acute Care Hospital [Member] | Texas [Member] | Steward [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital															1
Acute Care Hospital [Member] | Poole, England [Member] | Circle [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital																	1
Acute Care Hospital [Member] | California [Member] | Halsen Healthcare [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital																	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 [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 | Hospital									14
Acute Care Campus [Member] | Prospect [Member] | Investment in Financing Leases [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital									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 | Hospital													11
Purchase price of acquisition | $													$ 1,200.0
Stamp duties and registration fees | $													$ 66.6
Additional Properties [Member] | Switzerland [Member] | Infracore [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 | Hospital			1
Inpatient Rehabilitation Hospital [Member] | Germany [Member] | Other Acquisitions [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital																	1
Community Hospital [Member]
Business Acquisition [Line Items]
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 | Hospital												7
Purchase price of acquisition | $												$ 145,400,000