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Nature of Business and Financial Statement Presentation - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Nature Of Business And Financial Statement Presentation [Line Items] |  |
Prepay of taxes | $ 20,200,000 us-gaap_PrepaidTaxes |
Tax expense | 4,900,000 us-gaap_IncomeTaxExpenseBenefit | 684,000 us-gaap_IncomeTaxExpenseBenefit
Puerto Rico Tax Restructuring [Member] |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |
Number of assets owned | 15 ddr_NumberOfAssetsOwned / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Prepay of taxes | 20,200,000 us-gaap_PrepaidTaxes / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Effective tax rate | 10.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Taxable REIT subsidiary activity | 16,800,000 ddr_TaxableRealEstateInvestmentTrustSubsidiaryActivity / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Tax expense | $ 3,400,000 us-gaap_IncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Effective tax rate spread | 2.00%ddr_EffectiveIncomeTaxRateSpread / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Effective tax payment percent | 12.00%ddr_EffectiveIncomeTaxContinuingOperationsPaymentRate / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember |
Old Tax Rate [Member] | Puerto Rico Tax Restructuring [Member] |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |
Effective tax rate on capital gains | 29.00%ddr_EffectiveCapitalGainTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember / us-gaap_StatementScenarioAxis = ddr_OldTaxRateMember |
Effective tax rate | 39.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember / us-gaap_StatementScenarioAxis = ddr_OldTaxRateMember |
New Tax Rate [Member] | Puerto Rico Tax Restructuring [Member] |  |
Nature Of Business And Financial Statement Presentation [Line Items] |  |
Effective tax rate on capital gains | 12.00%ddr_EffectiveCapitalGainTaxRate / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember / us-gaap_StatementScenarioAxis = ddr_NewTaxRateMember |
Effective tax rate | 10.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityNameAxis = ddr_PuertoRicoTaxRestructuringMember / us-gaap_StatementScenarioAxis = ddr_NewTaxRateMember |

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