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Investments in and Advances to Joint Ventures - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
ShoppingCenter
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
ShoppingCenter
Investment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
ShoppingCenter
Schedule Of Equity Method Investments [Line Items]          
Reserve of preferred equity interests $ 6,373 $ 2,201 $ 12,106 $ 4,537  
Preferred investment interest valuation allowance $ 84,500   $ 84,500   $ 72,400
Unconsolidated Joint Ventures [Member]          
Schedule Of Equity Method Investments [Line Items]          
Shopping centers owned | ShoppingCenter 102   102   106
Unconsolidated Joint Ventures [Member] | Shopping Centers [Member]          
Schedule Of Equity Method Investments [Line Items]          
Number of properties sold | ShoppingCenter     4    
Proceeds from sale of joint venture assets     $ 129,500    
Gain on sale of joint venture assets     $ 1,500    
BRE DDR Joint Ventures [Member]          
Schedule Of Equity Method Investments [Line Items]          
Number of unconsolidated investments | Investment     2    
Maximum preferred investment fixed distribution deferral 2.00%   2.00%    
BRE DDR Joint Ventures [Member] | Preferred Equity Fixed Dividend Rate [Member]          
Schedule Of Equity Method Investments [Line Items]          
Preferred equity fixed dividend rate per annum     8.50%    
BRE DDR III [Member]          
Schedule Of Equity Method Investments [Line Items]          
Ownership interest of joint venture partner 95.00%   95.00%    
Ownership interest in joint venture 5.00%   5.00%    
BRE DDR IV [Member]          
Schedule Of Equity Method Investments [Line Items]          
Ownership interest of joint venture partner 95.00%   95.00%    
Ownership interest in joint venture 5.00%   5.00%