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Summary of Significant Accounting Policies - Non-cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Significant Noncash Transactions [Line Items] |  |  |
Contribution of net assets to Curbline Properties | $ 1,152,700 | $ 0 | $ 0
Consolidation of the net assets (excluding mortgages as disclosed below) of previously unconsolidated joint ventures | 0 | 0 | 42,800
Net assets acquired from unconsolidated joint ventures | 0 | 0 | 8,500
Dividends declared, but not paid | 0 | 63,806 | 30,400
Accounts payable related to construction in progress | 700 | 7,000 | 12,200
Accrued liabilities for sold properties | 0 | 5,400 | 0
Repurchase of operating partnership units | 0 | 4,100 | 0
Building [Member] |  |  |
Other Significant Noncash Transactions [Line Items] |  |  |
Assumption of buildings due to ground lease terminations | $ 2,700 | $ 0 | $ 2,900

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