Leases - Additional Information (Detail) $ in Thousands			6 Months Ended	12 Months Ended
	Jul. 06, 2015 Lease Option	Jun. 11, 2015 Property	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) ft² Property	Dec. 31, 2016 USD ($)	Jul. 07, 2015
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Base rent paid by Sears Holdings and subsidiaries under master lease			$ 100	$ 200	$ 200
Straight-line rent			5,600	$ 800	9,900
Number of real estate properties acquisition exercised | Property				56
Gross leasable area | ft²				7,411,187
Number of terminated properties announced for redevelopment | Property				18
Tenant reimbursements			26,926	$ 62,525	62,253
Additional rent based on percentage of tenants' sales				$ 500	100
Number of properties subject to ground lease | Property				1
Operating leases expiration year				2073
General and Administrative Expenses [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Rent expense			600	$ 700	600
Property operating expense [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Rent expense			25	$ 50	50
Sears Holdings Corporation [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Right to recapture property space				100.00%
Number of real estate properties wholly-owned | Property		234
Master Lease [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Lease term	10 years
Number of options for renewal of lease | Option	3
Renewal period of leases	5 years
Final option renewal period	4 years
Base rent paid by Sears Holdings and subsidiaries under master lease				$ 93,300	134,000
Number of renewal term that will be increased | Lease	2
Percentage of increase annual lease rent						2.00%
Right to recapture property space				50.00%
Number of real estate properties wholly-owned | Property				224
Lease termination, description				While the Company will be permitted to exercise its recapture rights all at once or in stages as to any particular property, it will not be permitted to recapture all or substantially all of the space subject to the recapture right at more than 50 Wholly Owned Properties during any lease year.
Number of real estate properties wholly-owned | Property				50
Tenant reimbursements			$ 25,204	$ 51,672	$ 55,823
Master Lease [Member] | Sears Holdings Corporation [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Number of options for renewal of lease | Option	1
Right to recapture property space				100.00%
Number of real estate properties wholly-owned | Property				21
Lease termination, description				The lease termination payment is calculated as the greater of an amount specified at the time the Company entered into the Master Lease with Sears Holdings and an amount equal to 10 times the adjusted EBITDA attributable to such space within the Sears Holdings main store which is not attributable to the space subject to the separate 50% recapture right discussed above for the 12-month period ending at the end of the fiscal quarter ending immediately prior to recapturing such space.
Percentage of reduction of fixed rent under master lease				20.00%
Lease termination notice period				90 days
Master Lease [Member] | Sears Holdings Corporation [Member] | Lease Terminations [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Base rent paid by Sears Holdings and subsidiaries under master lease				$ 23,600
Number of unprofitable stores to terminate | Property				56
Gross leasable area | ft²				7,400,000
Lease termination fees paid				$ 45,100