Real Estate and Other Activities - Net Assets Acquired (Parenthetical) (Detail) $ in Thousands, £ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Hospital	Dec. 31, 2019 USD ($) Hospital	Jun. 30, 2021 Property	Mar. 31, 2021 GBP (£)
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible lease assets (in years)		23 years 8 months 12 days
Loans repaid	[1]		$ 1,103,410	$ 834,743
Ernest [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital					4
Priory Group [Member]
Business Acquisition [Line Items]
Number of real estate assets acquired | Property						35
Steward Health Care System LLC [Member]
Business Acquisition [Line Items]
Number of facilities acquired | Hospital				2
Mortgage Loans [Member] | Ernest [Member]
Business Acquisition [Line Items]
Loans repaid					$ 100,000
Mortgage Loans [Member] | Priory Group [Member]
Business Acquisition [Line Items]
Loans repaid | £							£ 800
Mortgage Loans [Member] | Steward Health Care System LLC [Member]
Business Acquisition [Line Items]
Loans repaid				$ 740,000
Intangible Lease Assets [Member]
Business Acquisition [Line Items]
Weighted-average useful life of acquired intangible lease assets (in years)		21 years 3 months 18 days	34 years 6 months	27 years 6 months

[1] The 2021 column includes an £800 million mortgage loan advanced to the Priory Group (“Priory”) in the first quarter of 2021 and converted to fee simple ownership of 35 properties in the second quarter of 2021 as described below. The 2020 column includes approximately $740 million of loans advanced to Steward in 2017 and exchanged for the fee simple real estate of two hospitals as described below, as well as approximately $100 million of loans advanced to Ernest Health, Inc. (“Ernest”) in 2012 and exchanged for the fee simple real estate of four hospitals as described below.