Organization - Additional Information (Detail) $ in Thousands				3 Months Ended
	May 06, 2020	Feb. 28, 2019 Property	Jun. 11, 2015 USD ($) Property JointVenture RetailFacility	Mar. 31, 2020 USD ($) ft² Property State JointVenture	Mar. 31, 2019 USD ($)
Organization And Basis Of Presentation [Line Items]
Number of properties interested in the portfolio				208
Area of real estate property (in square feet) | ft²				9,232
Number of states in properties located | State				44
Number of properties				28
Number of joint venture acquired | JointVenture				28
Net cash (used in) provided by operating activities | $				$ 10,200	$ 16,771
Net cash (used in) provided by investing activities | $				$ 31,024	$ 56,595
Subsequent Event [Member] | COVID-19 Pandemic [Member]
Organization And Basis Of Presentation [Line Items]
Expected future rent, description	Company had collected approximately 47% of contractual base rent and tenant reimbursements billed for the month of April (54% from tenants other than Holdco).
Percent of contractual rental income collected	47.00%
Percent of tenant contractual rental income collected	54.00%
Sears Holdings Corporation [Member]
Organization And Basis Of Presentation [Line Items]
Business acquisition fair value, purchase price | $			$ 2,700,000
Number of real estate properties acquired			234
Number of ground leased properties acquired			1
Interests in joint ventures acquired			50.00%
Number of joint venture acquired | JointVenture			3
Sears Holdings Corporation [Member] | Joint Venture [Member]
Organization And Basis Of Presentation [Line Items]
Number of retail facilities | RetailFacility			28
Sears Holdings Corporation [Member] | Original Master Lease [Member]
Organization And Basis Of Presentation [Line Items]
Number of acquired properties leased			224
Wholly Owned Properties [Member] | Holdco Master Lease [Member]
Organization And Basis Of Presentation [Line Items]
Number of wholly owned properties				17
Joint Venture Properties [Member] | Holdco Master Joint Venture Leases [Member] | Recapturing And Termination [Member]
Organization And Basis Of Presentation [Line Items]
Number of properties leased				2
Joint Venture Properties [Member] | Sears Holdings Corporation [Member] | Joint Venture [Member]
Organization And Basis Of Presentation [Line Items]
Number of retail facilities subject to ground lease | RetailFacility			1
Number of retail facilities subject to lease | RetailFacility			2
Joint Venture Properties [Member] | Sears Holdings Corporation [Member] | Original Joint Venture Master Leases [Member]
Organization And Basis Of Presentation [Line Items]
Number of acquired properties leased			31
Real Estate Investment Trust [Member]
Organization And Basis Of Presentation [Line Items]
Area of real estate property (in square feet) | ft²				32,800,000
Real Estate Investment Trust [Member] | Wholly Owned Properties [Member]
Organization And Basis Of Presentation [Line Items]
Area of real estate property (in square feet) | ft²				28,300,000
Number of wholly owned properties				180
Number of states in properties located | State				44
Real Estate Investment Trust [Member] | Wholly Owned Properties [Member] | Sears Holdings Corporation [Member]
Organization And Basis Of Presentation [Line Items]
Number of wholly owned properties		51
Real Estate Investment Trust [Member] | Joint Venture Properties [Member]
Organization And Basis Of Presentation [Line Items]
Area of real estate property (in square feet) | ft²				4,500,000
Number of states in properties located | State				14
Number of properties				28