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Notes Receivable - Loans Receivable on Real Estate (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Receivables [Abstract] |  |
Balance at January 1 | $ 52,444 ddr_MortgageLoansReceivableBalance | $ 72,218 ddr_MortgageLoansReceivableBalance
Additions: |  |
Interest | 0 ddr_MortgageLoansOnRealEstateInterest | 473 ddr_MortgageLoansOnRealEstateInterest
Accretion of discount | 240 us-gaap_AccretionOfDiscount | 227 us-gaap_AccretionOfDiscount
Deductions: |  |
Payments of principal and interest | (6,042)ddr_PaymentsOfPrincipalAndInterest | (113)ddr_PaymentsOfPrincipalAndInterest
Balance at March 31 | $ 46,642 ddr_MortgageLoansReceivableBalance | $ 72,805 ddr_MortgageLoansReceivableBalance

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- Details
Name: | ddr_AdditionsAbstract
Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ddr_DeductionsAbstract
Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Mortgage loans on real estate interest. + References No definition available. + Details
Name: | ddr_MortgageLoansOnRealEstateInterest
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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. + Details
Name: | ddr_MortgageLoansReceivableBalance
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Payments of principal and interest. + References No definition available. + Details
Name: | ddr_PaymentsOfPrincipalAndInterest
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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 + Details
Name: | us-gaap_AccretionOfDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration