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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) (Level 3 [Member], Fair Value Measurements [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2014
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 75.5 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember | 67.0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 12.00 us-gaap_FairValueInputsPricePerSquareFoot / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember |
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 117.00 us-gaap_FairValueInputsPricePerSquareFoot / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember |
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_MarketCapitalizationRateMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_MarketCapitalizationRateMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember |
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 10.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_MarketCapitalizationRateMember / us-gaap_ValuationTechniqueAxis = ddr_IncomeCapitalizationApproachMember |
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 88.7 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_ValuationTechniqueAxis = ddr_IndicativeBidOrContractedPriceMember | 74.2 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfConsolidatedAssetsMember / us-gaap_ValuationTechniqueAxis = ddr_IndicativeBidOrContractedPriceMember
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 35.3 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember | 6.4 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 15.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_DiscountRatesMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_DiscountRatesMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember |
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 15.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_DiscountRatesMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember |
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 6.00%ddr_RangeOfValuationTechniqueUsedInFairValueMeasurementOfNonRecurringItems / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = ddr_ImpairmentOfJointVentureInvestmentsMember / us-gaap_ValuationAllowancesAndReservesTypeAxis = ddr_TerminalCapitalizationRateMember / us-gaap_ValuationTechniqueAxis = ddr_DiscountedCashFlowMember

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