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Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 27, 2021 USD ($) a | Mar. 31, 2021 USD ($) ShoppingCenter | Mar. 31, 2020 USD ($) | Dec. 31, 2020 ShoppingCenter
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Gain on sale of joint venture interest |  | $ 13,908 | $ 45,681 |
Undeveloped Land [Member] | Richmond Hill, Ontario [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Area of land sold | a | 70 |  |  |
Net proceeds after closing costs and foreign currency translation | $ 22,100 |  |  |
Amounts held in escrow | 6,100 |  |  |
Aggregate gain on transaction | 16,700 |  |  |
Gain reported by the joint venture | 2,800 |  |  |
Gain on sale of joint venture interest | 13,900 |  |  |
Undeveloped Land [Member] | Richmond Hill, Ontario [Member] | Amount of Funds in Escrow to be Received from Canadian Taxing Authority Pending Receipt of Certain Tax Certificates [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Amounts held in escrow | 4,100 |  |  |
Undeveloped Land [Member] | Richmond Hill, Ontario [Member] | Amount of Funds in Escrow to be Released Upon Final Dissolution of Partnership [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Amounts held in escrow | $ 2,000 |  |  |
Unconsolidated Joint Ventures [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Shopping centers owned | ShoppingCenter |  | 59 |  | 59

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