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Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) (Forward equity [Member]) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
May 2013, Contract [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Forward equity agreements contract date | May 2013
Forward equity agreements settlement date | September and October 2013
Forward Equity Agreement Entered, not included in computation of diluted EPS prior to the date of settlement | 39.1 ddr_IncrementalCommonSharesAttributableToEquityForwardAgreementsNotIncludedInComputationOfDilutedEps / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ddr_ForwardEquityMember / us-gaap_DerivativeInstrumentRiskAxis = ddr_ContractOneMember
January 2012, Contract [Member] |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
Forward equity agreements contract date | January 2012
Forward equity agreements settlement date | June 2012
Forward Equity Agreement Entered, not included in computation of diluted EPS prior to the date of settlement | 19.0 ddr_IncrementalCommonSharesAttributableToEquityForwardAgreementsNotIncludedInComputationOfDilutedEps / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = ddr_ForwardEquityMember / us-gaap_DerivativeInstrumentRiskAxis = ddr_ContractTwoMember

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- Definition Potentially dilutive security related to forward equity agreements. The contract date of the agreement. + References No definition available. + Details
Name: | ddr_ForwardEquityAgreementsContractDate
Namespace Prefix: | ddr_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Potentially dilutive security related to forward equity agreements. The settlement date of the agreement. + References No definition available. + Details
Name: | ddr_ForwardEquityAgreementsSettlementDate
Namespace Prefix: | ddr_
Data Type: | us-types:dateStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Incremental common shares attributable to equity forward agreements not included in computation of diluted EPS. + References No definition available. + Details
Name: | ddr_IncrementalCommonSharesAttributableToEquityForwardAgreementsNotIncludedInComputationOfDilutedEps
Namespace Prefix: | ddr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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