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Transactions with Related Parties - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 6 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
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Sep. 30, 2010 | Jun. 30, 2012 | Dec. 31, 2012 Store | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 EDT [Member] Directors | May 31, 2007 DDR joint venture [Member] | Dec. 31, 2012 ECE joint venture [Member] Directors | May 31, 2007 ECE joint venture [Member] | May 31, 2009 Otto Family [Member] | Dec. 31, 2010 Otto Family [Member] | Apr. 30, 2009 Otto Family [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Joint venture ownership percentage |  |  |  |  |  |  | 75.00% |  | 25.00% |  |  |
Number of directors |  |  |  |  |  | 2 |  | 2 |  |  |  |
Secured bridge loan |  |  |  |  |  |  |  |  |  |  |  | $ 60
Collateralized loan obtained |  |  |  |  |  |  |  |  |  | 60 |  |
Related transactions, interest rate |  |  | 10.00% |  |  |  |  |  |  | 9.00% |  |
Prepayment penalty charges |  |  |  |  |  |  |  |  |  |  | 0.9 |
Interest paid for loan |  |  |  |  |  |  |  |  |  |  | 1.9 |
Mezzanine loan | 31.7 |  |  |  |  |  |  |  |  |  |  |
Number of shopping centers |  |  | 6 |  |  |  |  |  |  |  |  |
Related party transaction maturity |  |  | 2017 |  |  |  |  |  |  |  |  |
Interest income |  | $ 1.5 |  | $ 3.2 | $ 0.9 |  |  |  |  |  |  |

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- Definition Short-Term financing which is expected to be paid back relatively quickly, such as by a subsequent longer-term loan. Also called swing loan or bridge financing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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