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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 |  |

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