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Acquisitions - Summary of Acquired Shopping Centers (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition Gross Purchase Price And Mortgage Debt Assumed [Line Items] |  |
Aggregate gain on change in control of interests | $ 80.0 | $ 22.7

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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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