Real Estate and Other Activities - Summary of Investments in Unconsolidated Real Estate Joint Ventures by Operator (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	$ 1,534,514	$ 1,152,927
MEDIAN [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	505,883	517,648
Swiss Medical Network [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	473,235	476,193
Steward (Macquarie Transaction) [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	400,367
Policlinico di Monza [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	93,833	95,468
HM Hospital [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated real estate joint ventures	$ 61,196	$ 63,618