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Investment in Consolidated and Unconsolidated Entities - Schedule of Joint Ventures (Details) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2013 USD ($) | Apr. 17, 2013 USD ($) ft² Properties | Dec. 31, 2017 USD ($) ft² | Dec. 31, 2016 USD ($) ft² | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Area of real estate property | ft² |  |  | 501,276 | 322,326 |  |
Loss on contribution to joint venture |  |  | $ 0 | $ 0 | $ (12,919) |
Contributions to unconsolidated entities |  |  | 6,875 | 7,200 | 35,326 |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Investment |  |  | 180,764 | 178,728 |  |
Unconsolidated Entities [Member] |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Investment |  |  | $ 180,764 | 178,728 |  |
Unconsolidated Entities [Member] | IAGM Retail Fund I, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments in joint ventures, properties contributed | Properties |  | 13 |  |  |  |
Area of real estate property | ft² |  | 2,109,324 |  |  |  |
Gross Disposition Price | $ 34,350 | $ 409,280 |  |  |  |
Amortization period for the basis adjustment |  |  | 30 years |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Description |  |  | Multi-tenant retail shopping centers |  |  |
Ownership % |  |  | 55.00% |  |  |
Investment |  | 96,788 | $ 123,693 | 126,090 |  |
Unconsolidated Entities [Member] | Downtown Railyard Venture, LLC [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 18,088
Stated interest rate (percent) |  |  |  |  |  | 4.00%
Loss on contribution to joint venture |  |  |  |  | 12,919 |
Proceeds from equity method investment, dividends or distributions, return of capital |  |  |  |  | 4,092 |
Contributions to unconsolidated entities |  |  |  |  | $ 3,000 |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Description |  |  | Land development |  |  |
Ownership % |  |  | 90.00% |  |  |
Investment |  |  | $ 57,183 | 52,365 |  | $ 46,174
Unconsolidated Entities [Member] | Other Unconsolidated Entities [Member] |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Description |  |  | Various real estate investments |  |  |
Investment |  |  | $ (112) | $ 273 |  |
PGGM Private Real Estate Fund [Member] | IAGM Retail Fund I, LLC [Member] |  |  |  |  |  |
Schedule of net equity investment and share of net income or loss |  |  |  |  |  |
Investment |  | $ 79,190 |  |  |  |

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