Real Estate and Other Activities - Net Assets Acquired (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Liabilities assumed		$ (134,203)
Total net assets acquired	$ 1,778,417	1,973,661
Land and Land Improvements [Member]
Business Acquisition [Line Items]
Total assets acquired		265,991
Building [Member]
Business Acquisition [Line Items]
Total assets acquired		1,608,771
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Total assets acquired		231,774
Mortgage Loans [Member]
Business Acquisition [Line Items]
Total assets acquired	1,090,400
Other Loans and Assets [Member]
Business Acquisition [Line Items]
Total assets acquired	$ 688,017	$ 1,328