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Investments in and Advances to Joint Ventures - Summary of Terms For Unconsolidated Joint Ventures Investments (Detail) - BRE DDR Retail Holdings Joint Venture Acquisitions [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
ShoppingCenter
Dec. 31, 2015
USD ($)
ShoppingCenter
Oct. 31, 2014
USD ($)
ShoppingCenter
BRE DDR III [Member]      
Schedule Of Equity Method Investments [Line Items]      
Unconsolidated Joint Venture Partner Formation Date Month And Year 2014-10    
Common Equity Initial     $ 19.6
Preferred Investment (Principal) $ 265.9   $ 300.0
Preferred Investment, Net of Reserve $ 216.0    
Properties Owned | ShoppingCenter 37   70
BRE DDR IV [Member]      
Schedule Of Equity Method Investments [Line Items]      
Unconsolidated Joint Venture Partner Formation Date Month And Year 2015-12    
Common Equity Initial   $ 12.9  
Preferred Investment (Principal) $ 67.1 $ 82.6  
Preferred Investment, Net of Reserve $ 56.0    
Properties Owned | ShoppingCenter 6 6  
BRE DDR III and IV [Member]      
Schedule Of Equity Method Investments [Line Items]      
Preferred Investment (Principal) $ 333.0 $ 382.6  
Preferred Investment, Net of Reserve $ 272.0