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Transactions with Curbline Properties - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2026
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Fee and other income | $ 2,897 | $ 1,559 | $ 16,878 | $ 5,864 |
Rental income | 24,203 | 59,441 | 86,315 | 236,703 |
Other income (expense), net | (3,937) | $ (34,726) | $ (16,363) | $ (70,724) |
Fee percentage of aggregate amount of gross revenue |  |  | 2.00% |  |
Amounts payable to curbline | 28,700 |  | $ 28,700 |  |
Amounts receivable from curbline | 300 |  | 300 |  |
Shared Services Agreement [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Fee and other income | 800 |  | 2,000 |  |
Rental income | 400 |  | 1,200 |  |
Other income (expense), net | 800 |  | 2,000 |  |
Other [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Fee and other income | 900 |  | 2,400 |  |
Separation and Distributions Agreement [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Estimated cost of redevelopment projects | 28,400 |  | 28,400 |  |
Separation and Distributions Agreement [Member] | Forecast [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Annual rent expense |  |  |  |  | $ 800
Curbline [Member] |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Incremental fair value of services provided to Curbline | 800 |  | 2,000 |  |
Embedded lease charge | $ 400 |  | $ 1,200 |  |

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