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Investments in Unconsolidated Joint Ventures (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Depreciable Basis In Years 40 years  
Equity of certain joint ventures less than zero  
CityOn.Xi'an [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 49.00% 49.00%
Country Club Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Fair Oaks Mall [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
International Plaza [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.10% 50.10%
The Mall at Millenia [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Stamford Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Starfield Hanam [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 34.30% 34.30%
Sunvalley [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
The Mall at University Town Center [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Waterside Shops [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00% 50.00%
Westfarms [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 79.00% 79.00%
CityOn.Zhengzhou [Member]    
Schedule of Equity Method Investments [Line Items]    
Notes Receivable, Related Parties $ 47.4 $ 46.1