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Investments in Unconsolidated Joint Ventures - Narrative (Details)
ft² in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 17, 2017
USD ($)
Mar. 28, 2016
USD ($)
Mar. 01, 2016
USD ($)
ft²
Jan. 14, 2016
USD ($)
ft²
Jan. 06, 2016
USD ($)
ft²
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
Investments in unconsolidated joint ventures:                    
Gain on sale or write down of assets, net           $ (477) $ 10,915 $ 49,088 $ 445,371  
Gain (loss) on remeasurement, sale or write down of assets, net           $ (2) $ 5 $ 4,544    
Office building                    
Investments in unconsolidated joint ventures:                    
Gain on sale of building $ 2,290                  
Joint Venture | Country Club Plaza                    
Investments in unconsolidated joint ventures:                    
Property area (in square feet) | ft²     1,006              
Ownership percentage owned (percent)     50.00%              
Purchase price     $ 660,000              
Purchase price paid through assumption of debt by the Company   $ 320,000 $ 330,000              
Effective interest rate   3.88%                
Country Club Plaza | Joint Venture | Office building                    
Investments in unconsolidated joint ventures:                    
Proceeds from sale of building 78,000                  
Gain on sale of building $ 4,580                  
Arrowhead Towne Center                    
Investments in unconsolidated joint ventures:                    
Ownership interest         40.00%   40.00%   40.00%  
Property area (in square feet) | ft²         1,197          
Proceeds from sale         $ 289,496          
Gain on sale or write down of assets, net             $ 101,629      
Cash proceeds from sale of business         129,496          
Debt proceeds from sale of business         $ 160,000          
MAC Heitman Portfolio | Joint Venture                    
Investments in unconsolidated joint ventures:                    
Ownership interest       49.00%           49.00%
Proceeds from sale       $ 771,478            
Gain on sale or write down of assets, net       340,734            
Cash proceeds from sale of business       478,608            
Debt proceeds from sale of business       $ 292,870            
MAC Heitman Portfolio | Deptford Mall | Joint Venture                    
Investments in unconsolidated joint ventures:                    
Property area (in square feet) | ft²       1,039            
MAC Heitman Portfolio | FlatIron Crossing | Joint Venture                    
Investments in unconsolidated joint ventures:                    
Property area (in square feet) | ft²       1,432            
MAC Heitman Portfolio | Twenty Ninth Street | Joint Venture                    
Investments in unconsolidated joint ventures:                    
Property area (in square feet) | ft²       847