Investments in Unconsolidated Entities - Summary of Company's Investments in Unconsolidated Entities (Detail)	6 Months Ended
	Jun. 30, 2023 ft² Property
Income Statement Equity Method Investments [Line Items]
Number of Properties	12
Total GLA | ft²	831,900
Brookfield Properties Retail I [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	2
Total GLA | ft²	136,000
Brookfield Properties Retail II [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	3
Total GLA | ft²	262,500
Simon Property Group Inc [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	3
Total GLA | ft²	275,700
Invesco Real Estate [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	1
Total GLA | ft²	51,500
Invesco Real Estate II [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	1
Total GLA | ft²	106,200
RD Management [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	1
Landmark Land Holdings, LLC [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	31.30%
Number of Properties	1