Real Estate and Other Activities - Net Assets Acquired (Detail) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Total assets acquired		$ 1,332,962	$ 5,350,239	$ 4,249,180
Liabilities assumed		(25,727)	(82,508)	(140,866)
Loans repaid	[1]		(1,103,410)	(834,743)
Total net assets acquired		1,332,962	4,246,829	3,414,437
Land and Land Improvements [Member]
Business Acquisition [Line Items]
Total assets acquired		135,301	642,312	365,281
Building [Member]
Business Acquisition [Line Items]
Total assets acquired		487,698	2,381,654	2,547,313
Intangible Lease Assets [Member]
Business Acquisition [Line Items]
Total assets acquired		45,394	262,385	642,699
Mortgage Loans [Member]
Business Acquisition [Line Items]
Total assets acquired	[1],[2]	159,735	1,113,300	176,840
Investments in Financing Leases [Member]
Business Acquisition [Line Items]
Total assets acquired				114,797
Equity Investments [Member]
Business Acquisition [Line Items]
Total assets acquired				1,328
Other Loans and Assets [Member]
Business Acquisition [Line Items]
Total assets acquired				103,195
Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures [Member]
Business Acquisition [Line Items]
Total assets acquired		399,456		233,593
Investments In Unconsolidated Operating Entities [Member]
Business Acquisition [Line Items]
Total assets acquired		$ 131,105	$ 1,033,096	$ 205,000

[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.

[2] In the 2022 second quarter, we increased our mortgage loan to Prospect Medical Holdings, Inc. ("Prospect") that was originated in 2019 and that is secured by a first lien on a California hospital. The loan bears interest at a current market rate plus a component of additional interest upon repayment.