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Mortgage Notes Payable - Footnotes (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |
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Oct. 28, 2024 | Aug. 22, 2024 | May 24, 2024 | Mar. 19, 2024 | Jan. 25, 2024 | Nov. 16, 2023 | Oct. 06, 2023 | Jul. 09, 2023 | Jun. 05, 2023 | Jan. 20, 2023 | Jan. 03, 2023 | Dec. 09, 2022 | May 06, 2022 | Sep. 30, 2024 | Sep. 30, 2023 | May 14, 2024 | Apr. 21, 2024 | Dec. 31, 2023
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,529,000 |  |  |  | $ 0
Unamortized deferred finance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,782,000 |  |  |  | 21,148,000
Payments to acquire interest in joint venture |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,008,000 | $ 55,578,000 |  |  |
Mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,342,216,000 |  |  |  | 4,136,136,000
Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,727,000 |  |  |  | 0
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
South Plains Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,802,000 |  |  |  | $ 0
Freehold Raceway Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  | 49.90% |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire interest in joint venture |  |  |  |  |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Danbury Fair Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  | $ 85,000 |  |  | $ 155,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  | 6.72% |  |  | 6.39% |  |  |  |  |  |  |  |  |  |  |  |  |
Fashion District Philadelphia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 26,107,000 |  |  |  |  |  |  |  |
Extension term (in years) |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,171,000 |
Fashion District Philadelphia | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  | 3.60% |  |  |  |  |  |  |  |
Fashion Outlets at Niagara Falls USA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension term (in years) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  |  |  | 5.90% |  |  |  |  |  |  |  |  |  |  |
Green Acres Mall And Commons |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  | 5.90% |  |  |  |  |  |  |
Extension term (in years) |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Face amount on debt |  |  |  |  |  |  |  |  |  |  | $ 370,000,000 |  |  |  |  |  |  |
Oaks, The |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  | $ 5,000,000 |  |  |  |  |
Extension term (in years) |  |  | 2 years |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Oaks, The | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oaks, The | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Queens Center | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) | 5.37% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount on debt | $ 525,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Santa Monica Place |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension term (in years) |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Santa Monica Place | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  |  |  |  | 1.52% |  |  |  |  |  |  |  |  |  |
Interest rate cap (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |
Santa Monica Place | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans payable on real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  |  |  |  | 1.48% |  |  |  |  |  |  |  |  |  |
Interest rate cap (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |

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