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Investments in Unconsolidated Joint Ventures - Narrative (Details) $ in Thousands | Mar. 29, 2021 USD ($) | Dec. 29, 2020 USD ($) | Dec. 10, 2020 USD ($) | Nov. 17, 2020 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) property | Dec. 28, 2020 | Dec. 09, 2020 USD ($)
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  | $ 4,518,108 | $ 4,560,810 |  |
Sears South Plains |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  | 100.00% |  |
Tysons Corner LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Loan funding |  |  |  | $ 45,000 |  |  |  |
Fashion District Philadelphia |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 4.00% |  |  |
FlatIron Crossing |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 7,650 |  |  |  |  |  |
Joint Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Number of properties | property |  |  |  |  |  | 9 |  |
Joint Venture | Fashion District Philadelphia |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Extension term |  |  | 1 year |  |  |  |  |
Joint Venture | Fashion District Philadelphia | LIBOR |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 3.50% |  |  |  |  |
Joint Venture | Fashion District Philadelphia | LIBOR floor |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  | 0.50% |  |  |  |  |
Joint Venture | Fashion District Philadelphia |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  | $ 201 |  |  |  |  | $ 301
Repayments of debt |  |  | $ 100 |  |  |  |  |
Accrued interest percent to be repaid prior to cash distributions |  |  | 15.00% |  |  |  |  |
Joint Venture | Tysons Corner LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 95,000 |  |  |  |
Effective interest rate (as a percent) |  |  |  | 3.43% |  |  |  |
Loan funding |  |  |  | $ 90,000 |  |  |  |
Joint Venture | Tysons Corner LLC | Future advance potential |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Loan funding |  |  |  | $ 5 |  |  |  |
Joint Venture | Fashion District Philadelphia |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Cash distribution, percent |  |  | 50.00% |  |  |  |  |
Joint Venture | FlatIron Crossing |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 15 |  |  |  |  |  |
Extension term |  | 1 year |  |  |  |  |  |
Interest rate on debt |  | 4.10% |  |  |  |  | 3.85% |
Joint Venture | Paradise Valley Mall |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage | 5.00% |  |  |  |  |  |  |
Payments for joint venture | $ 3,819 |  |  |  |  |  |  |
Joint venture partner | Fashion District Philadelphia |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Cash distribution, percent |  |  | 50.00% |  |  |  |  |

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