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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 |  |  |  |  |  |

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