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Investments in and Advances to Joint Ventures - Additional Information (Detail) | 12 Months Ended |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2014 USD ($) Transaction JointVenture | Dec. 31, 2013 USD ($) Transaction JointVenture | Dec. 31, 2014 Shopping Center [Member] ShoppingCenter | Dec. 31, 2013 Shopping Center [Member] ShoppingCenter | Dec. 31, 2012 Shopping Center [Member] ShoppingCenter | Dec. 31, 2014 Chicago Assets | Apr. 28, 2014 Parent Company USD ($) | Dec. 31, 2014 Parent Company USD ($) | Apr. 28, 2014 Sonae Sierra Brazil [Member] BRL ShoppingCenter | Dec. 31, 2013 Sonae Sierra Brazil [Member] BRL | Dec. 31, 2012 Sonae Sierra Brazil [Member] BRL | Dec. 31, 2014 Service Holdings LLC Joint Venture [Member] ShoppingCenter | Dec. 31, 2014 Joint Venture Assets Previously Written Down to Zero [Member] USD ($) Assets | Dec. 31, 2014 Blackstone III [Member] | Dec. 31, 2013 Blackstone II [Member] | Dec. 31, 2014 Coventry II Joint Ventures [Member] USD ($) ShoppingCenter | Dec. 31, 2014 BRE DDR Retail Holdings [Member] Blackstone III [Member] | Dec. 31, 2014 BRE DDR Retail Holdings [Member] Blackstone II [Member] | Dec. 31, 2013 BRE DDR Retail Holdings [Member] Blackstone II [Member] | Dec. 31, 2014 BRE DDR Retail Holdings I [Member] ShoppingCenter | Dec. 31, 2014 Coventry II Westover LLC [Member] USD ($) | Dec. 31, 2014 Unconsolidated Joint Ventures [Member] Shopping Center [Member] ShoppingCenter | Dec. 31, 2013 Unconsolidated Joint Ventures [Member] Shopping Center [Member] ShoppingCenter | Dec. 31, 2012 Unconsolidated Joint Ventures [Member] Shopping Center [Member] ShoppingCenter
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of retail sites/centers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 ddr_NumberOfAssetsWithZeroBasis / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_CoventryIIJointVenturesMember |  |  |  |  |  |  |  |
Number of transactions | 2 ddr_NumberOfTransactions | 2 ddr_NumberOfTransactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | 2 ddr_NumberOfJointVentures | 2 ddr_NumberOfJointVentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of joint venture partner | 95.00%ddr_OwnershipInterestOfJointVenturePartner |  |  |  |  |  |  |  |  |  |  |  |  | 95.00%ddr_OwnershipInterestOfJointVenturePartner / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneThreeMember | 95.00%ddr_OwnershipInterestOfJointVenturePartner / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoMember |  |  |  |  |  |  |  |  |
Ownership interest in joint venture |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 66.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = ddr_SonaeSierraBrazilMember |  |  |  |  |  |  |  | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneThreeMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BlackstoneGroupMember |  | 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BlackstoneGroupMember |  |  |  |  |
Redemption of preferred equity in full at companys option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | after seven years |  |  |  |  |  |  |
Interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BlackstoneGroupMember |  |  |  |  |  |
Number of centers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 ddr_NumberOfRealEstatePropertiesAcquired / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIMember |  |  |  |
Proceeds from sale of unconsolidated joint venture assets |  |  |  |  |  |  | $ 343,600,000 us-gaap_EquityMethodInvestmentNetSalesProceeds / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment interest percentage |  |  |  |  |  |  | 33.00%ddr_InvestmentInterestPercentage / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Sale of Interests |  |  |  |  |  |  |  | 83,700,000 us-gaap_GainOnSaleOfInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale and change in control of interests |  |  |  |  |  |  |  | 19,700,000 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shopping centers owned |  |  | 415 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember | 416 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember | 452 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember |  |  |  | 10 us-gaap_NumberOfRealEstateProperties / dei_LegalEntityAxis = ddr_SonaeSierraBrazilMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average exchange rate used for recording the equity in net income |  |  |  |  |  |  |  |  | 2.26 ddr_WeightedAverageExchangeRateUsedForRecordingEquityInNetIncome / dei_LegalEntityAxis = ddr_SonaeSierraBrazilMember | 2.14 ddr_WeightedAverageExchangeRateUsedForRecordingEquityInNetIncome / dei_LegalEntityAxis = ddr_SonaeSierraBrazilMember | 1.94 ddr_WeightedAverageExchangeRateUsedForRecordingEquityInNetIncome / dei_LegalEntityAxis = ddr_SonaeSierraBrazilMember |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of unconsolidated joint venture assets |  |  |  |  |  |  |  | 4,400,000 us-gaap_GainLossOnDispositionOfAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  | 18,400,000 us-gaap_GainLossOnDispositionOfAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_CoventryIIWestoverLlcMember |  |  |
Number of properties sold |  |  |  |  |  |  |  |  |  |  |  | 3 ddr_NumberOfAssetsSold / dei_LegalEntityAxis = ddr_ServiceHoldingsLlcJointVentureMember |  |  |  |  |  |  |  |  |  | 37 ddr_NumberOfAssetsSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember | 27 ddr_NumberOfAssetsSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember | 7 ddr_NumberOfAssetsSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember / us-gaap_StatementBusinessSegmentsAxis = ddr_ShoppingCenterMember
Number of foreclosed asset |  |  |  |  |  | 1 ddr_NumberOfForeclosedAssets / invest_InvestmentGeographicRegionAxis = ddr_ChicagoMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to joint ventures | $ 414,848,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 448,008,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  |  |  |  |  |  |  |  | $ 0 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = ddr_JointVentureAssetsPreviouslyWrittenDownToZeroMember |  |  | $ 900,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_CoventryIIJointVenturesMember |  |  |  |  |  |  |  |
Number of assets foreclosed and sold |  |  |  |  |  |  |  |  |  |  |  |  | 4 ddr_NumberOfAssetsForeclosedAndSold / dei_LegalEntityAxis = ddr_JointVentureAssetsPreviouslyWrittenDownToZeroMember |  |  |  |  |  |  |  |  |  |  |

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- Definition The percentage of ownership of equity participation by the joint venture partner for the investee accounted for under the equity method of accounting. + References No definition available. + Details
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- Definition Weighted-average exchange rate used for recording the equity in net income in U.S. dollars for an investment accounted for using the equity method. + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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