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Investments in and Advances to Joint Ventures - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Property
Investment
Dec. 31, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Property
Schedule Of Equity Method Investments [Line Items]      
Reserve of preferred equity interests $ 15,544 $ 11,422 $ 61,000
Dividend, aggregate amount 17,300 12,200  
Shopping Centers and Land [Member]      
Schedule Of Equity Method Investments [Line Items]      
Gain on sale of joint venture assets $ 4,200 $ 13,700 $ 5,700
Unconsolidated Joint Ventures [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of properties sold | Property 6 40 15
Unconsolidated Joint Ventures [Member] | Shopping Centers and Land [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of properties sold | Property   3  
Proceeds from sale of joint venture assets $ 356,300 $ 786,500 $ 545,600
Proceeds from sale of joint venture assets to company   $ 35,100  
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%    
Redemption of preferred equity in full or in part at partners option during the first three years    
Redemption of preferred investment in full at company option after seven years    
Dividend, cash interest rate 6.50%    
Dividend, accrued PIK interest rate 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]      
Redemption of preferred investment in full at company option year 2021    
BRE DDR III [Member] | Preferred Shares [Member]      
Schedule Of Equity Method Investments [Line Items]      
Net asset sale proceeds allocation percentage 52.90%    
BRE DDR III [Member] | Common Equity [Member]      
Schedule Of Equity Method Investments [Line Items]      
Net asset sale proceeds allocation percentage 47.10%    
BRE DDR III [Member] | Affiliate of Blackstone [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership interest of joint venture partner 95.00%    
BRE DDR III [Member] | Affiliates of SITE Centers [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership interest of joint venture partner 5.00%    
BRE DDR IV [Member]      
Schedule Of Equity Method Investments [Line Items]      
Redemption of preferred investment in full at company option year 2022    
BRE DDR IV [Member] | Affiliate of Blackstone [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership interest of joint venture partner 95.00%    
BRE DDR IV [Member] | Affiliates of SITE Centers [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership interest of joint venture partner 5.00%