Real Estate and Other Activities - Net Assets Acquired (Detail) - USD ($) $ in Thousands		Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Total assets acquired		$ 3,137,451	$ 2,226,302
Liabilities assumed		(65,411)	(134,203)
Loans repaid	[1]	(1,090,400)
Total net assets acquired		2,047,051	2,226,302
Land and Land Improvements [Member]
Business Acquisition [Line Items]
Total assets acquired		345,039	265,991
Building [Member]
Business Acquisition [Line Items]
Total assets acquired		825,322	1,608,771
Intangible Lease Assets
Business Acquisition [Line Items]
Total assets acquired		96,455	231,774
Mortgage Loans [Member]
Business Acquisition [Line Items]
Total assets acquired		1,090,400	47,641
Equity Investments [Member]
Business Acquisition [Line Items]
Total assets acquired		108,710
Other Loans and Assets [Member]
Business Acquisition [Line Items]
Total assets acquired		$ 736,936	$ 206,328

[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