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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 |  |  |  |

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