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Organization, Formation, and Basis of Presentation - Real Estate Properties Acquired ,Developed and/or Disposed (Detail) | 1 Months Ended | 24 Months Ended | 1 Months Ended
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Jul. 31, 2012 West Park | Dec. 31, 2012 Belvedere | Dec. 31, 2011 Business Development One | Dec. 31, 2011 Business Development One Minimum | Dec. 31, 2011 Business Development One Maximum | Dec. 31, 2011 Business Development Two | Dec. 31, 2011 Business Development Two Minimum | Dec. 31, 2011 Business Development Two Maximum | Feb. 28, 2011 Business Acquisition Three | Sep. 30, 2011 Business Acquisition Four | Sep. 30, 2011 Business Acquisition Five | Sep. 30, 2011 Business Acquisition Six | Dec. 31, 2012 Business Acquisition Seven | Dec. 31, 2012 Business Acquisition Eight
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Name of Property | West Park | Belvedere | Clarendon Center North |  |  | Clarendon Center South |  |  |  |  |  |  |  |
Location | Oklahoma City, Oklahoma | Baltimore, Maryland | Arlington, Virginia |  |  | Arlington, Virginia |  |  |  |  |  |  |  |
Type | Shopping Center | Shopping Center | Mixed-Use |  |  | Mixed-Use |  |  | Shopping Center | Shopping Center | Shopping Center | Shopping Center | Shopping Center | Shopping Center
Year of Acquisition |  |  |  |  |  |  |  |  | Feb. 28, 2011 | Sep. 30, 2011 | Sep. 30, 2011 | Sep. 30, 2011 | Dec. 31, 2012 | Dec. 31, 2012
Year of Development |  |  |  | 2010 | 2011 |  | 2010 | 2011 |  |  |  |  |  |
Year of Disposal | Jul. 31, 2012 | Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Business Acquisition Year + References No definition available. + Details
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- Definition Business Development Year + References No definition available. + Details
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- Definition Location of Real Estate Property + References No definition available. + Details
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- Definition Name of Property + References No definition available. + Details
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- Definition Property Type + References No definition available. + Details
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- Details
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