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Investments in and Advances to Joint Ventures - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Feb. 27, 2021
USD ($)
a
Jun. 30, 2021
USD ($)
ShoppingCenter
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
ShoppingCenter
Jun. 30, 2020
USD ($)
Dec. 31, 2020
ShoppingCenter
Schedule Of Equity Method Investments [Line Items]            
Gain on sale of joint venture interest   $ 0 $ (128) $ 13,908 $ 45,553  
Company's proportionate share of gain on sale of joint venture assets       $ 2,600    
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   56   56   59
Number of properties sold | ShoppingCenter       3    
Proceeds from sale of joint venture assets       $ 37,000