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Notes Receivable - Loans Receivable on Real Estate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Balance at January 1	$ 72,218ddr_MortgageLoansReceivableBalance	$ 60,378ddr_MortgageLoansReceivableBalance
Additions:
New mortgage loans	0ddr_NewMortgageLoans	26,508ddr_NewMortgageLoans
Interest	810ddr_MortgageLoansOnRealEstateInterest	773ddr_MortgageLoansOnRealEstateInterest
Accretion of discount	926us-gaap_AccretionOfDiscount	874us-gaap_AccretionOfDiscount
Deductions:
Payments of principal and interest	(460)ddr_PaymentsOfPrincipalAndInterest	(16,315)ddr_PaymentsOfPrincipalAndInterest
Loan loss reserve	(500)us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1	0us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1	(4,300)us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Other	(20,550)us-gaap_MortgageLoansOnRealEstateOtherDeductions	0us-gaap_MortgageLoansOnRealEstateOtherDeductions
Balance at December 31	$ 52,444ddr_MortgageLoansReceivableBalance	$ 72,218ddr_MortgageLoansReceivableBalance

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- Definition

Mortgage loans on real estate interest.

+ References

No definition available.

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- Definition

Amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position related to mortgage loans receivable.

+ References

No definition available.

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- Definition

Total amount of new mortgage loans during the reporting period.

+ References

No definition available.

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- Definition

Payments of principal and interest.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 35

-Subparagraph (h)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62500-109447

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- Definition

The amount of reductions in principal on mortgage loans other than foreclosures, costs of mortgages sold, and amortization of premium during the reporting period.

+ 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)

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-Paragraph 1

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- Definition

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

+ References

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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

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

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