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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Financing arrangement obligation | $ 134,379 | $ 273,900 |  |  |  |
Accumulated deficit | (2,339,619) | (1,944,012) |  |  |  |
Cumulative effect of adoption | 2,445,260 | 2,830,970 |  | $ 3,188,432 |  | $ 3,967,999
Total lease liabilities | 73,839 |  |  |  |  |
Deferred charges and other assets, net | 306,959 | 277,866 |  |  |  |
Accounts payable and accrued expenses | 68,825 | 51,027 |  |  |  |
Other accrued liabilities | 298,594 | 265,595 |  |  |  |
Total lease liabilities | 16,377 |  | $ 15,268 |  |  |
Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of adoption | $ (2,339,619) | $ (1,944,012) |  | (1,614,357) |  | (830,279)
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of adoption |  |  |  | (2,203) |  | (424,859)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cumulative effect of adoption |  |  |  | $ (2,203) |  | $ (424,859)
Joint venture | Financing arrangement | Freehold Raceway Mall and Chandler Fashion Center | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Financing arrangement obligation |  |  |  |  | $ 393,709 |
Accumulated deficit |  |  |  |  | 424,859 |
Freehold Raceway Mall and Chandler Fashion Center | Joint venture | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investments in unconsolidated joint ventures |  |  |  |  | $ 31,150 |
ASU 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Total lease liabilities |  |  | 109,299 |  |  |
Deferred charges and other assets, net |  |  | 59,736 |  |  |
Accounts payable and accrued expenses |  |  | (5,978) |  |  |
Other accrued liabilities |  |  | $ (4,342) |  |  |

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