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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
Mar. 31, 2013
Dec. 31, 2012
Equity Method Investments And Joint Ventures [Abstract]    
Preferred equity investment in BRE DDR Retail Holdings, LLC $ 155.3 $ 154.6