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Acquisitions - Summary of Acquired Shopping Centers (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2013 Tampa, FL, Atlanta, GA, Newport News, VA and Richmond, VA (2 assets) [Member] | Jun. 30, 2013 Parcels Adjacent to Existing Shopping Centers [Member] | Jun. 30, 2013 Dallas, TX [Member] | Jun. 30, 2013 Oakland, CA [Member]
Business Acquisition [Line Items] |  |  |  |  |
Acquisition date of shopping centers |  | April 2013 | June 2013 | March 2013 | February 2013
Gross Purchase Price |  | $ 110.5 | $ 11.7 | $ 40.3 | $ 41.1
Face Value of Mortgage Debt Assumed | $ 103.8 |  |  |  |

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