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Investments in and Advances to Joint Ventures - Investments in and Advances to Joint Ventures (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
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Jun. 30, 2013 Assets | Dec. 31, 2012
Equity Method Investments And Joint Ventures [Abstract] |  |
Preferred equity investment in BRE DDR Retail Holdings, LLC | $ 167.1 | $ 154.6
Number of joint venture assets acquired | 30 |
Preferred equity interest | $ 146 |

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