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Investments in Unconsolidated Joint Ventures (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Feb. 14, 2019
Dec. 31, 2018
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%   50.00%
CityOn.Zhengzhou [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 49.00% 49.00%   49.00%
Country Club Plaza [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%   50.00%
Fair Oaks Mall [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%   50.00%
The Gardens Mall [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 48.50% 48.50%   0.00%
International Plaza [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.10% 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%   50.00%
Stamford Town Center [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%   50.00%
Starfield Hanam [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 17.15% 17.15%   34.30%
Sunvalley [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 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%   50.00%
Waterside Shops [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 50.00% 50.00%   50.00%
Westfarms [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage 79.00% 79.00%   79.00%
Blackstone Transaction [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Ownership Interest Agreed to be Sold     50.00%  
Blackstone Transaction [Member] | CityOn.Xi'an [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage     25.00%  
Blackstone Transaction [Member] | CityOn.Zhengzhou [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Ownership Percentage     24.50%  
Blackstone Transaction [Member] | Starfield Hanam [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Ownership Interest Sold   50.00%    
Equity Method Investment, Ownership Percentage 17.15% 17.15%    
The Gardens Mall [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Ownership Interest Acquired   48.50%    
Starfield Hanam [Member]        
Schedule of Equity Method Investments [Line Items]        
Promote Fee Income $ 4.8 $ 4.8    
CityOn.Zhengzhou [Member]        
Schedule of Equity Method Investments [Line Items]        
Notes Receivable, Related Parties $ 42.3 $ 42.3   $ 43.6
Blackstone [Member] | Starfield Hanam [Member]        
Schedule of Equity Method Investments [Line Items]        
Equity Method Investment, Summarized Financial Information, Ownership Interest Purchased By Joint Venture Partner   14.70%