Investments in Unconsolidated Joint Ventures - Summary of Company's Investments in Unconsolidated Joint Ventures (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) ft² Property
Income Statement Equity Method Investments [Line Items]
Number of properties | Property	31
Total GLA | ft²	5,450
Initial Investment | $	$ 429,012
General Growth Properties, Inc. [Member]
Income Statement Equity Method Investments [Line Items]
Number of properties | Property	12
Total GLA | ft²	2,162
Initial Investment | $	$ 165,000
Seritage % Ownership	50.00%
The Macerich Company [Member]
Income Statement Equity Method Investments [Line Items]
Number of properties | Property	9
Total GLA | ft²	1,574
Initial Investment | $	$ 150,000
Seritage % Ownership	50.00%
Simon Property Group Inc [Member]
Income Statement Equity Method Investments [Line Items]
Number of properties | Property	10
Total GLA | ft²	1,714
Initial Investment | $	$ 114,012
Seritage % Ownership	50.00%