Business (Details) $ / shares in Units, $ in Thousands, ft² in Millions	May 04, 2021 $ / shares	Jun. 30, 2021 USD ($) ft² property building	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)
Noncontrolling Interest [Line Items]
Cash and cash equivalents | $		$ 2,965,788	$ 2,987,225	$ 3,437,775
Monmouth Real Estate Investment Corporation
Noncontrolling Interest [Line Items]
Business acquisition, conversion basis	0.67
Business acquisition, quarterly dividend (in dollars per share) | $ / shares	$ 0.18
Business acquisition, share price (in dollars per share) | $ / shares	$ 25.00
Business acquisition, transaction costs | $		$ 4,200
Consolidated Properties
Noncontrolling Interest [Line Items]
Number of real estate properties | property		4
Number of buildings | building		8
Square footage (in sqft) | ft²		1.5
Operating Trust
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent		99.80%