Real Estate Activities - 2019 Activity - Additional Information (Detail) € in Millions, £ in Millions, SFr in Millions, $ in Millions															12 Months Ended
	Dec. 23, 2019 GBP (£) Hospital RenewalOption	Dec. 17, 2019 USD ($) Hospital Lease RenewalOption	Dec. 03, 2019 EUR (€) Hospital	Nov. 28, 2019 EUR (€)	Aug. 30, 2019 USD ($) Hospital 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 ($) Hospital	May 27, 2019 CHF (SFr) _Campus	Apr. 12, 2019 Hospital	Apr. 03, 2019	Aug. 28, 2018 EUR (€) Hospital	Dec. 31, 2019 USD ($) Hospital	Dec. 31, 2018 USD ($)	Aug. 31, 2018
Business Acquisition [Line Items]
Term of lease extension, years															5 years
Mortgage loan balance | $															$ 1,819,854,000	$ 1,586,520,000
Term loan | $						$ 112,900,000
Additional number of businesses acquired						2
Performance thresholds achievement period						3 years
Weighted average remaining lease term											23 years				31 years 10 months 24 days
Other Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | $															$ 135,000,000
Spain [Member] | Spanish PropCo. [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method			45.00%
Ramsay [Member]
Business Acquisition [Line Items]
Term of lease							18 years
Swiss Healthcare Real Estate Company Infracore S A [Member]
Business Acquisition [Line Items]
Purchase price of acquisition | SFr											SFr 236.6
Swiss Healthcare Real Estate Company Infracore S A [Member] | Joint Venture Partner [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method											46.00%
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
Maximum [Member]
Business Acquisition [Line Items]
Term of lease															15 years
Future purchase price adjustment | $						$ 250,000,000.0
Minimum [Member]
Business Acquisition [Line Items]
Term of lease															10 years
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
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] | England [Member]
Business Acquisition [Line Items]
Number of private hospitals acquired							8
Acute Care Hospital [Member]
Business Acquisition [Line Items]
Number of facilities acquired		10
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] | 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] | Germany [Member]
Business Acquisition [Line Items]
Ownership interest in joint venture under the equity method																	50.00%
Acute Care Hospital [Member] | Vibra [Member]
Business Acquisition [Line Items]
Number of facilities acquired					7
Acute Care Hospital [Member] | Steward Health Care System LLC [Member] | Texas [Member]
Business Acquisition [Line Items]
Number of facilities acquired												1
Acute Care Hospital [Member] | BMI Healthcare [Member] | England [Member]
Business Acquisition [Line Items]
Number of facilities acquired	30
Purchase price of acquisition | £	£ 1,500
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 Hospital [Member] | BMI Healthcare [Member] | Poole, England [Member]
Business Acquisition [Line Items]
Number of facilities acquired															1
Term of lease													14 years
Fixed annual escalations													2.50%
Acute Care Hospital [Member] | Halsen Healthcare [Member] | California [Member]
Business Acquisition [Line Items]
Number of facilities acquired															1
Acute Care Hospital [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] | Swiss Healthcare Real Estate Company Infracore S A [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] | 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
Hospital [Member] | Healthscope [Member]
Business Acquisition [Line Items]
Term of lease										20 years
Additional Properties [Member] | Swiss Healthcare Real Estate Company Infracore S A [Member] | Switzerland [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] | 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
Inpatient Rehabilitation Hospital [Member] | Vibra [Member]
Business Acquisition [Line Items]
Number of facilities acquired					3
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] | Kansas [Member]
Business Acquisition [Line Items]
Number of facilities acquired									7
Purchase price of acquisition | $									$ 145,400,000
Community Hospital [Member] | Saint Luke's Health System [Member]
Business Acquisition [Line Items]
Term of lease									14 years