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Investments in and Advances to Joint Ventures - Investments in and Advances to Joint Ventures (Parenthetical) (Detail) (USD $) |  | 1 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 Blackstone Group LP [Member] | Oct. 31, 2013 BRE DDR Retail Holdings I [Member] | Dec. 31, 2012 BRE DDR Retail Holdings I [Member] | Jun. 30, 2012 BRE DDR Retail Holdings I [Member] | Dec. 31, 2013 Assets Acquired [Member] BRE DDR Retail Holdings I [Member] Assets | Dec. 31, 2012 Assets Acquired [Member] BRE DDR Retail Holdings I [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Preferred equity investments with affiliates of Blackstone | $ 71,771,000 |  | $ 154,556,000 | $ 150,000,000 |  |
Preferred investment applied to acquisition |  | $ 110,000,000 |  |  |  | $ 110,000,000
Number of assets acquired |  |  |  |  | 30 |

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