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Investments in Unconsolidated Joint Ventures - Narrative (Details) ft² in Thousands |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
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Jul. 31, 2024 USD ($) ft² | Jun. 28, 2024 USD ($) | Jun. 27, 2024 USD ($) | May 14, 2024 USD ($) | Jan. 10, 2024 USD ($) | Dec. 27, 2023 USD ($) ft² | Dec. 04, 2023 USD ($) | May 18, 2023 USD ($) property | Apr. 25, 2023 USD ($) | Mar. 03, 2023 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2024 | Nov. 16, 2023 | May 09, 2023 USD ($) | May 17, 2018 property
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  | $ 59,340,000 |  | $ 152,798,000 | $ 108,123,000 | $ 153,464,000 |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.90% |  |
Chandler Fashion Center, Danbury Fair Mall, Freehold Raceway Mall, Los Cerritos Center and Washington Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Chandler Fashion Center, Danbury Fair Mall, Freehold Raceway Mall, Los Cerritos Center and Washington Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  | $ 51,363,000 |  |  |  |  |  |  |  |  |  |  |
Number of properties (property) | property |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  | $ 46,687,000 |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | South Plains Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage at completion of acquisition (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Third Party | Chandler Fashion Center, Danbury Fair Mall, Freehold Raceway Mall, Los Cerritos Center and Washington Square |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Third Party | Arrowhead Towne Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  | $ 36,447,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Venture | Third Party | South Plains Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scottsdale Fashion Square | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  |  | $ 403,931,000 |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  |  | 6.21% |  |  |  |  |  |  |  |  |
Deptford Mall |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 5,100,000 |  |  |  |  |  |  |  |  |  |
Deptford Mall | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  |  |  | 3.73% |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Country Club Plaza |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, default amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 147,605,000 |
Debt extinguished |  | $ 147,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Country Club Plaza | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, default amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 295,210,000 |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | $ 100,997,000 |  |  |  |  |  |  |
Proceeds from sale of building |  | 175,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguished |  | $ 295,470,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chandler Fashion Center, Danbury Fair Mall, Freehold Raceway Mall, Los Cerritos Center and Washington Square | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  | $ 66,953,000 |  |  | $ 120,643,000 |  |  |  |  |
Chandler Fashion Center, Danbury Fair Mall, Freehold Raceway Mall, Los Cerritos Center and Washington Square | Joint Venture | Seritage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties (property) | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5
Tysons Corner LLC | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  |  | $ 666,465,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  | $ 710,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Tysons Corner LLC | Joint Venture | Fixed Rate Residential Mortgage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  |  |  |  |  | 6.60% |  |  |  |  |  |  |  |  |  |  |  |
Office Property in Los Angeles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 324,632,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  | $ 77,643,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale or write down of assets, net |  |  |  |  |  | $ 8,118,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Office Property in Los Angeles | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² |  |  |  |  |  | 680,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of building |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Propcor II Associates, LLC Boulevard Shops | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 24,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate spread (as a percent) |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate cap (as a percent) |  |  |  |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development of Premium Outlets in Los Angeles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  | $ 57,686,000 |  |  |  |  |  |  |
Development of Premium Outlets in Los Angeles | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Chandler Fashion Center | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 256,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 17,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) |  |  | 7.06% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount on debt |  |  | $ 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Biltmore Fashion Park Retail Center in Phoenix, Arizona | Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property area (in square feet) | ft² | 611 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale or write down of assets, net | $ 42,815,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest percentage sold | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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