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Investments in and Advances to Joint Ventures - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2021 USD ($) a | Sep. 30, 2021 USD ($) ShoppingCenter | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) ShoppingCenter | Sep. 30, 2020 USD ($) | Dec. 31, 2020 ShoppingCenter
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |
Gain on sale of joint venture interest |  | $ 35 | $ 82 | $ 13,943 | $ 45,635 |
Company's proportionate share of gain on sale of joint venture assets |  |  |  | $ 2,400 |  |
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 | 16,800 |  |  |  |  |
Gain reported by the joint venture | 2,800 |  |  |  |  |
Gain on sale of joint venture interest | 14,000 |  |  |  |  |
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 |  | 55 |  | 55 |  | 59
Number of properties sold | ShoppingCenter |  |  |  | 4 |  |
Proceeds from sale of joint venture assets |  |  |  | $ 53,400 |  |

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