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Property, net - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 18, 2017 | May 31, 2016 | Apr. 13, 2016 | Jan. 14, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jan. 06, 2016
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  | $ 69,364 | $ 68,175 | $ 138,320 | $ 138,078 |  |
Gain on sale or write down of assets, net |  |  |  |  | $ (477) | 10,915 | 49,088 | 445,371 |  |
Adjustment to contingent consideration |  |  |  |  |  |  |  | 14,750 |  |
Cascade and Northgate Malls |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal | $ 59,698 |  |  |  |  |  |  |  |  |
Write down of investment |  |  |  |  |  |  | (10,138) |  |  |
Capitola Mall |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  | $ 24,894 |  |  | 24,894 |  | 24,894 |  |
Freestanding store |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  | $ (3,066) |  |  |  | 3,066 |  | $ 3,066 |  |
The Marketplace at Flagstaff Mall |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal |  |  |  |  |  | (7,188) | $ 7,188 |  |  |
Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sale or write down of assets, net |  |  |  |  |  | $ 101,629 |  |  |  |
Ownership interest |  |  |  |  |  | 40.00% |  | 40.00% |  | 40.00%
MAC Heitman Portfolio | Joint Venture |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Gain on sale or write down of assets, net |  |  |  | $ 340,734 |  |  |  |  |  |
Ownership interest |  |  |  | 49.00% |  |  |  |  | 49.00% |

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