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Property, net - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
Nov. 16, 2017
May 31, 2016
Apr. 13, 2016
Jan. 14, 2016
Jan. 06, 2016
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 01, 2018
Property, Plant and Equipment [Abstract]                        
Depreciation expense                 $ 275,236 $ 277,917 $ 277,270  
Property, Plant and Equipment [Line Items]                        
Impairment of real estate                 (54,469) (22,108) (39,671)  
Write-off of development cost                 28,266 1,046    
Gain on sale of assets                 (31,825) 42,446 415,348  
Outside partner interest of the operating partnership                       75.00%
Gain on land sales                 4,989 1,564 4,546  
Write down of non-real estate investment assets                   10,138    
Gain on sale of assets                 14,331 33,825 (375)  
Gain (loss) on sale or write down of assets, net                 $ (31,825) 42,446 415,348  
Loss on write-off of development costs                     1,538  
Contingent settlement payment                     (12,180)  
Westside Pavilion | Joint venture                        
Property, Plant and Equipment [Line Items]                        
Gain on sale of assets $ 46,242           $ 46,242          
Outside partner interest of the operating partnership 75.00%                      
Cascade and Northgate Malls                        
Property, Plant and Equipment [Line Items]                        
Gain on disposal                   $ 59,577    
500 North Michigan Avenue                        
Property, Plant and Equipment [Line Items]                        
Gain on disposal   $ 14,597                    
Arrowhead Towne Center                        
Property, Plant and Equipment [Line Items]                        
Gain on sale of assets                     $ 101,629  
Percentage of ownership interest sold                     40.00%  
Arrowhead Towne Center | Joint venture                        
Property, Plant and Equipment [Line Items]                        
Gain on sale of assets           $ 101,629            
MAC Heitman Portfolio                        
Property, Plant and Equipment [Line Items]                        
Percentage of ownership interest sold                   49.00%    
MAC Heitman Portfolio | Joint venture                        
Property, Plant and Equipment [Line Items]                        
Gain on sale of assets         $ 340,734              
Capitola Mall                        
Property, Plant and Equipment [Line Items]                        
Gain on disposal       $ 24,894                
Gain (loss) on sale or write down of assets, net                   $ 24,894    
Mervyn's (former locations)                        
Property, Plant and Equipment [Line Items]                        
Gain on disposal     $ (3,066)                  
Gain (loss) on sale or write down of assets, net                   $ (3,066)    
Promenade at Casa Grande                        
Property, Plant and Equipment [Line Items]                        
Gain on sale of assets               $ (311)