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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2018 | Jan. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Liability—Co-venture obligation | $ 0 | $ 58,973 |  |  |
Accumulated deficit | (830,279) | (488,782) |  |  |
Cumulative effect of adoption of ASU 2016-09 | 6,484 |  |  |  |
Debt extinguishment costs | 0 | 12,028 | $ 14,579 |  |
ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center | Joint venture |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Accumulated deficit | 424,850 |  |  |  |
Pro forma | ASU 2014-09 | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center | Joint venture |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Liability—Co-venture obligation |  |  |  | $ 393,700 |
Accumulated Deficit |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of adoption of ASU 2016-09 | 6,484 |  |  |  |
Accumulated Deficit | ASU 2016-09 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of adoption of ASU 2016-09 |  |  |  |  | $ 6,484
Freehold Raceway Mall and Chandler Fashion Center | Joint venture |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Investments in unconsolidated joint ventures | $ 31,150 | 0 |  |  |
Liability—Co-venture obligation |  | $ 58,973 |  |  |

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