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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