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Investments in and Advances to Joint Ventures - Schedule of Business Acquisitions (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items]      
Transaction value at 100% $ 407,705,000us-gaap_BusinessCombinationConsiderationTransferred1 $ 1,063,681,000us-gaap_BusinessCombinationConsiderationTransferred1  
Mortgage debt assumed at 100% 293,300,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 969,700,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 271,600,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
New mortgage financings at 100% 400,000,000us-gaap_OtherLongTermDebt 400,000,000us-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   7ddr_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIMember
 
Gross leasable area ("GLA")   2,300,000ddr_NumberOfSquareFeetOfGrossLeasableAreaOfShoppingCenters
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIMember
 
DDR common equity interest (5%)   3,500,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIMember
 
Redeemable preferred equity   30,000,000us-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%   332,000,000us-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%   206,600,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIMember
 
New mortgage financings at 100%   28,000,000us-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 70ddr_NumberOfRealEstatePropertiesAcquired
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIIMember
   
Gross leasable area ("GLA") 11,400,000ddr_NumberOfSquareFeetOfGrossLeasableAreaOfShoppingCenters
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIIMember
   
DDR common equity interest (5%) 19,600,000us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIIMember
   
Redeemable preferred equity 300,000,000us-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% 1,930,000,000us-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% 436,800,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1
/ us-gaap_BusinessAcquisitionAxis
= ddr_BREDDRRetailHoldingsJointVentureAcquisitionsMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ddr_BREDDRRetailHoldingsIIIMember
   
New mortgage financings at 100% $ 800,000,000us-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