Financing Arrangement - Narrative (Details) ft² in Thousands	Sep. 30, 2009 ft²	Mar. 31, 2021 $ / ft²	Dec. 31, 2020 $ / ft²
Schedule of Joint Ventures [Line Items]
Terminal capitalization rate		5.75%	5.50%
Discount rate		7.25%	7.00%
Financing Arrangement | Minimum
Schedule of Joint Ventures [Line Items]
Market rent per square foot | $ / ft²		35	35
Financing Arrangement | Maximum
Schedule of Joint Ventures [Line Items]
Market rent per square foot | $ / ft²		105	105
Financing Arrangement | Chandler Freehold
Schedule of Joint Ventures [Line Items]
Percentage of loan assumed by third party	49.90%
Financing Arrangement | Chandler Fashion Center
Schedule of Joint Ventures [Line Items]
Property area (in square feet) | ft²	1,318
Financing Arrangement | Freehold Raceway Mall
Schedule of Joint Ventures [Line Items]
Property area (in square feet) | ft²	1,552