Financing Arrangement - Narrative (Details) ft² in Thousands	Sep. 30, 2009 ft²	Jan. 01, 2018
Schedule of Joint Ventures [Line Items]
Discount rate		5.80%
Financing Arrangement
Schedule of Joint Ventures [Line Items]
Net operating income multiple		21
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)	1,318
Financing Arrangement | Freehold Raceway Mall
Schedule of Joint Ventures [Line Items]
Property area (in square feet)	1,672
Minimum | Financing Arrangement
Schedule of Joint Ventures [Line Items]
Market rent per square foot		30
Maximum | Financing Arrangement
Schedule of Joint Ventures [Line Items]
Market rent per square foot		100