Organization - Additional Information (Detail) ft² in Millions, $ in Billions			6 Months Ended
	Feb. 11, 2019 RetailFacility	Jun. 11, 2015 USD ($) Property JointVenture RetailFacility	Jun. 30, 2019 ft² shares Property JointVenture State	Feb. 28, 2019 Property
Organization And Basis Of Presentation [Line Items]
Number of joint venture acquired | JointVenture			27
Operations Commenced Date			Jul. 07, 2015
Number of properties interested in the portfolio			221
Area of real estate property (in square feet) | ft²			35.1
Number of states in properties located | State			45
Number of properties			27
Joint Venture Properties [Member]
Organization And Basis Of Presentation [Line Items]
Area of real estate property (in square feet) | ft²			4.8
Number of states in properties located | shares			14
Number of properties			27
Joint Venture Properties [Member] | Holdco JV Leases [Member]
Organization And Basis Of Presentation [Line Items]
Number of properties leased			4
Wholly Owned Properties [Member]
Organization And Basis Of Presentation [Line Items]
Area of real estate property (in square feet) | ft²			30.3
Number of wholly owned properties			194
Number of states in properties located | State			45
Sears Holdings Corporation [Member]
Organization And Basis Of Presentation [Line Items]
Business acquisition fair value, purchase price | $		$ 2.7
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
Sears Holdings Corporation [Member] | Joint Venture Properties [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
Sears Holdings Corporation [Member] | Joint Venture Properties [Member] | Original Joint Venture Master Leases [Member]
Organization And Basis Of Presentation [Line Items]
Number of acquired properties leased		31
Holdco [Member]
Organization And Basis Of Presentation [Line Items]
Number of real estate properties acquired | RetailFacility	425
Holdco Master Lease [Member]
Organization And Basis Of Presentation [Line Items]
Master lease executed, number of acquired properties				51
Holdco Master Lease [Member] | Wholly Owned Properties [Member]
Organization And Basis Of Presentation [Line Items]
Number of wholly owned properties			50