Real Estate and Other Activities - Net Assets Acquired (Detail) - USD ($) $ in Thousands		Mar. 31, 2023	Mar. 31, 2022
Business Acquisition [Line Items]
Total assets acquired		$ 72,900	$ 724,795
Liabilities assumed			(25,727)
Loans repaid	[1]	(22,900)
Total net assets acquired		50,000	724,795
Land and Land Improvements [Member]
Business Acquisition [Line Items]
Total assets acquired		9,313	9,671
Building [Member]
Business Acquisition [Line Items]
Total assets acquired		11,652	204,829
Intangible Lease Assets [Member]
Business Acquisition [Line Items]
Total assets acquired		1,935	5,461
Investments in Unconsolidated Real Estate Joint Ventures [Member]
Business Acquisition [Line Items]
Total assets acquired			399,456
Investments In Unconsolidated Operating Entities [Member]
Business Acquisition [Line Items]
Total assets acquired		$ 50,000	$ 131,105

[1] The 2023 column includes a $23 million mortgage loan to Springstone Health Opco, LLC ("Springstone") that was converted to fee simple ownership of one property as described below.