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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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Acquisition of joint venture partners ownership interest in shopping centers.

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Mortgage loan on real estate days delinquent.

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Maturity date of the principal amount.

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Number of mortgage loans on real estate related to loan loss reserve.

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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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014



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-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

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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674



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-Number 210

-Section 29

-Article 12



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-Name Regulation S-X (SX)

-Number 210

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Amount of reserve for write-down of a mortgage loan on real estate.

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-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



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-Number 210

-Section 29

-Article 12



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Topic 948

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-Section S99

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