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	6 Months Ended
	Jun. 30, 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
Redeemable preferred equity – DDR	$ 314.5		$ 300.0
Preferred Investment, Net of Reserve	$ 244.5
Properties Owned | ShoppingCenter	48		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
Redeemable preferred equity – DDR	$ 73.4	$ 82.6
Preferred Investment, Net of Reserve	$ 67.4
Properties Owned | ShoppingCenter	6	6
BRE DDR III and IV [Member]
Schedule Of Equity Method Investments [Line Items]
Redeemable preferred equity – DDR	$ 387.9	$ 382.6
Preferred Investment, Net of Reserve	$ 311.9