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Notes Receivable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 SecurityLoan | Dec. 31, 2012 SecurityLoan | Oct. 31, 2013 Subsequent Events [Member] ShoppingCenter
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of loans receivable outstanding | 7 | 6 |
Number of prime power centers acquired |  |  | 30
Maturity date of the principal amount | September 2011 |  |
Principal amount of loans subject to delinquent principal or interest | $ 9.8 |  |
Number of loans outstanding | 1 |  |
Loan loss reserve | $ 4.3 |  |
Past due on interest payments | 90 days |  |

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- Definition Acquisition of joint venture partners ownership interest in shopping centers. + References No definition available. + Details
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- Definition Mortgage loan on real estate days delinquent. + References No definition available. + Details
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- Definition Maturity date of the principal amount. + References No definition available. + Details
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- Definition Number of mortgage loans on real estate related to loan loss reserve. + References No definition available. + Details
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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
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