Investments in Unconsolidated Entities - Summary of Company's Investments in Unconsolidated Entities (Detail)	12 Months Ended
	Dec. 31, 2022 ft² Property
Income Statement Equity Method Investments [Line Items]
Number of Properties	17
Total GLA | ft²	1,461,000
Brookfield Properties Retail I [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	2
Total GLA | ft²	113,400
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
The Macerich Company [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	5
Total GLA | ft²	480,200
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	103,000
Invesco Real Estate II [Member]
Income Statement Equity Method Investments [Line Items]
Seritage % Ownership	50.00%
Number of Properties	1
Total GLA | ft²	226,200
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