Organization - Additional Information (Detail) $ in Billions			3 Months Ended
	Jun. 11, 2015 USD ($) Property JointVenture RetailFacility	Jun. 03, 2015 shares	Mar. 31, 2018 ft² Property JointVenture State
Organization And Basis Of Presentation [Line Items]
Number of joint venture acquired | JointVenture			24
Operations Commenced Date			Jul. 07, 2015
Area of real estate property (in square feet) | ft²			8,905,487
Number of states in properties located | State			49
Number of properties			24
Real Estate Investment Trust [Member]
Organization And Basis Of Presentation [Line Items]
Number of properties interested in the portfolio			249
Area of real estate property (in square feet) | ft²			38,900,000
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			34,600,000
Number of wholly owned properties			225
Number of states in properties located | State			49
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			4,300,000
Number of states in properties located | State			13
Number of properties			24
Third Party Tenants [Member]
Organization And Basis Of Presentation [Line Items]
Number of properties leased to third party tenants			54
Third Party Tenants [Member] | Wholly Owned Properties [Member]
Organization And Basis Of Presentation [Line Items]
Remaining wholly owned properties			80
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
Number of properties leased			81
Number of vacant properties			26
Number of properties leased to under master leases			22
Primary tenant JV properties leased			9
Primary tenant JV properties vacant			1
Sears Holdings Corporation [Member] | Wholly Owned Properties [Member]
Organization And Basis Of Presentation [Line Items]
Number of wholly owned properties			145
Sears Holdings Corporation [Member] | Joint Venture [Member]
Organization And Basis Of Presentation [Line Items]
Number of retail facilities | RetailFacility	28
Number of retail facilities subject to ground lease | RetailFacility	1
Number of retail facilities subject to lease | RetailFacility	2
Sears Holdings Corporation [Member] | Third Party Tenants [Member]
Organization And Basis Of Presentation [Line Items]
Number of properties leased			64
Primary tenant JV properties leased			13
Class A Common Shares [Member]
Organization And Basis Of Presentation [Line Items]
Number of shares initially capitalized | shares		100