Investments in Unconsolidated Entities - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Nov. 17, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Impairment of real estate assets		$ 95,826	$ 64,108	$ 0
Gain on sale of real estate		221,681	88,555	71,104
Net proceeds from disposition of interest in unconsolidated entities			19,551
Gain on sale of interest in unconsolidated joint venture			1,758
West Hartford JV [Member]
Schedule Of Equity Method Investments [Line Items]
Income earned from servicing activities		$ 1,000	$ 300	$ 1,600
Alexandria V A [Member]
Schedule Of Equity Method Investments [Line Items]
Seritage % Ownership	31.25%
Gain on sale of real estate	$ 22,600