Leases - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) Property	Mar. 31, 2020 USD ($)
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Number of properties subject to ground lease | Property		1
Number of properties subject to corporate office lease | Property		1
Operating leases expiration year		2073
Sales-leaseback financing obligations	$ 20,425	$ 20,582
Reversal of straight line rent		$ 1,000	$ 0
Sears Holdings Corporation [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Number of real estate properties acquisition exercised | Property | Property		87
Hialeah
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Sales-leaseback financing obligations	$ 21,000
Sale leaseback term	25 years
Sale leaseback Interest rate	7.00%
Sale leaseback base rent	$ 1,500
Percentage of increase in annual rent	1.50%
Sale leaseback description	The Company has a purchase option during years four, five or seven of the 25-year term to reacquire, solely at the Company’s option, the Hialeah property at a predetermined price
Holdco Master Lease [Member] | Original And Holdco Master Lease [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Lease termination, description		Under the terms of the Holdco Master Lease, Holdco had the right, at any time, to terminate the Holdco Master Lease with respect to any property upon the payment of a termination fee equal to one year of base rent plus annual taxes and other operating expenses. Sears Holdings exercised termination rights with respect to 87 properties under the Original Master Lease prior to its rejection on March 12, 2019 and Holdco exercised termination rights with respect to all remaining properties under the Holdco Master Lease during the year ended December 31, 2020, with the remaining five properties effective in March 2021.
Original And Holdco Master Lease [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Reversal of straight line rent		$ 0	4,500
General and Administrative Expenses [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Rent expense		400	300
Property Operating Expense
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
Rent expense		100	$ 100
Prepaid Expenses, Deferred Expenses and Other Assets, Net [Member]
Schedule Of Operating Leases Future Minimum Payments Receivable [Line Items]
ROU assets	$ 18,800	$ 18,600