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Property, net - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 16, 2017
Jan. 18, 2017
May 31, 2016
Apr. 13, 2016
Jan. 14, 2016
Jan. 06, 2016
Nov. 19, 2015
Oct. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]                      
Depreciation expense                 $ 277,917 $ 277,270 $ 354,977
Property, Plant and Equipment [Line Items]                      
Gain on land sales                 1,564 4,546 1,807
Gain (loss) on sale or write down of assets, net                 42,446 415,348 378,248
Write down of non-real estate investment assets                 10,138    
Write-off of development cost                 1,046 1,538  
Gain (loss) on sale of assets                 33,825 (375) 9,850
Gain on sale of assets                 42,446 415,348 378,248
Impairment of real estate                 $ (22,108) (39,671) (9,963)
Contingent settlement payment                   (12,180)  
Loss on write-off of development costs                     (852)
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 (loss) 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  
PPR Portfolio                      
Property, Plant and Equipment [Line Items]                      
Gain (loss) on sale of assets               $ 311,194      
Percentage of ownership interest sold                   40.00%  
Gain on sale of assets                   $ 2,336
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)  
Panorama Mall                      
Property, Plant and Equipment [Line Items]                      
Gain on disposal             $ 73,726