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Investments in and Advances to Joint Ventures - Schedule of Business Acquisitions (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items] |  |  |
Transaction value at 100% | $ 407,705,000 us-gaap_BusinessCombinationConsiderationTransferred1 | $ 1,063,681,000 us-gaap_BusinessCombinationConsiderationTransferred1 |
Mortgage debt assumed at 100% | 293,300,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | 969,700,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 | 271,600,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
New mortgage financings at 100% | 400,000,000 us-gaap_OtherLongTermDebt | 400,000,000 us-gaap_OtherLongTermDebt |
BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR Retail Holdings II [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Date acquired | 2013-08 |  |
Number of centers |  | 7 ddr_NumberOfRealEstatePropertiesAcquired / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Gross leasable area ("GLA") |  | 2,300,000 ddr_NumberOfSquareFeetOfGrossLeasableAreaOfShoppingCenters / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
DDR common equity interest (5%) |  | 3,500,000 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Redeemable preferred equity |  | 30,000,000 us-gaap_RedeemableNoncontrollingInterestEquityPreferredCarryingAmount / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Preferred equity fixed dividend rate per annum |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Transaction value at 100% |  | 332,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Maximum preferred equity fixed distribution deferral |  | 22.20%ddr_PercentageDeferralOfFixedDistributionAtJointVenturePartnersOption / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Mortgage debt assumed at 100% |  | 206,600,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
New mortgage financings at 100% |  | 28,000,000 us-gaap_OtherLongTermDebt / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR Retail Holdings III [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Date acquired | 2014-10 |  |
Number of centers | 70 ddr_NumberOfRealEstatePropertiesAcquired / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Gross leasable area ("GLA") | 11,400,000 ddr_NumberOfSquareFeetOfGrossLeasableAreaOfShoppingCenters / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
DDR common equity interest (5%) | 19,600,000 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Redeemable preferred equity | 300,000,000 us-gaap_RedeemableNoncontrollingInterestEquityPreferredCarryingAmount / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Preferred equity fixed dividend rate per annum | 8.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Transaction value at 100% | 1,930,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Maximum preferred equity fixed distribution deferral | 23.50%ddr_PercentageDeferralOfFixedDistributionAtJointVenturePartnersOption / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Mortgage debt assumed at 100% | 436,800,000 us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
New mortgage financings at 100% | $ 800,000,000 us-gaap_OtherLongTermDebt / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |
Unpaid Preferred Equity Distributions [Member] | BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR Retail Holdings II [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Preferred equity fixed dividend rate per annum |  | 9.00%us-gaap_PreferredStockDividendRatePercentage / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_DividendsAxis = ddr_AccruedAndUnpaidDividendsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIMember |
Unpaid Preferred Equity Distributions [Member] | BRE DDR Retail Holdings Joint Venture Acquisitions [Member] | BRE DDR Retail Holdings III [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Preferred equity fixed dividend rate per annum | 8.50%us-gaap_PreferredStockDividendRatePercentage / us-gaap_BusinessAcquisitionAxis = ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember / us-gaap_DividendsAxis = ddr_AccruedAndUnpaidDividendsMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_BREDDRRetailHoldingsIIIMember |  |

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