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Benefit Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based payments award, number of shares available for grant | 6,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Compensation fully earned and vested description | The 2013 VSEP awards, if earned, may result in the granting of common shares of the Company to participants on measurement dates over the three-year term, subject to an additional four-year service-based vesting schedule. As a result, in general, the total compensation available to participants under the 2013 VSEP will be fully earned and vested only after seven years or December 31, 2019. |  |
Non-qualified elective deferred compensation plan | 100% of their base salaries, commissions and annual performance-based cash bonuses, less applicable taxes and benefits deductions |  |
Matching contribution to participant | The Company provides a matching contribution in the Elective Deferred Compensation Plan to any participant who defers to the Elective Deferred Compensation Plan based upon the lesser of (1) 3% of the participant’s total cash compensation or (2) 50% of total deferrals to the 401(k) and the Elective Deferred Compensation Plans combined, less any matching contributions made to the participant’s 401(k) plan. |  |
Contribution to deferred compensation | $ 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution | $ 0.1 us-gaap_DeferredCompensationArrangementWithIndividualEmployerContribution
Deferred Compensation aggregated | 3.7 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability | 3.5 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |
Number of common shares | 500,000 ddr_SharesOutstandingUnderEquityDeferredCompensationPlan | 500,000 ddr_SharesOutstandingUnderEquityDeferredCompensationPlan |
Vesting of restricted stock grants | 100,000 ddr_VestingOfRestrictedStockUnderEquityDeferredCompensationPlan | 100,000 ddr_VestingOfRestrictedStockUnderEquityDeferredCompensationPlan | 100,000 ddr_VestingOfRestrictedStockUnderEquityDeferredCompensationPlan
Deferred compensation obligations for vested restricted stock recorded in equity | 1.1 ddr_DeferredCompensationArrangementForVestedRestrictedStockRecordedInEquity | 1.1 ddr_DeferredCompensationArrangementForVestedRestrictedStockRecordedInEquity | 1.8 ddr_DeferredCompensationArrangementForVestedRestrictedStockRecordedInEquity
Reduction of deferred obligation | 1.3 us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid | 1.1 us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid | 1.1 us-gaap_DeferredCompensationArrangementWithIndividualDistributionsPaid
401K Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of compensation subject to statutory limits | 50.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember |  |
Percentage of participant's contribution | 50.00%ddr_DefinedContributionPlanEmployerContributionMaximum / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember |  |
Percentage of participant's base salary plus annual cash bonus | 3.00%ddr_MaximumAnnualCashBonusAsPercentageOfBaseSalaryAndCashBonus / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember |  |
Percentage of vested contributions | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember |  |
Contribution by the company | 1.1 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember | 1.1 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember | 1.0 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_PlanNameAxis = ddr_FourHundredAndOneKPlanMember
Elective Deferred Compensation Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of vested contributions | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage / us-gaap_PlanNameAxis = ddr_ElectiveDeferredCompensationPlanMember |  |
Equity Deferred Compensation Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Value of common shares | 8.3 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = ddr_EquityDeferredCompensationPlanMember | 7.1 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = ddr_EquityDeferredCompensationPlanMember |
Directors Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Value of common shares | 8.8 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = ddr_DirectorsPlanMember | 6.6 us-gaap_StockGrantedDuringPeriodValueSharebasedCompensationGross / us-gaap_PlanNameAxis = ddr_DirectorsPlanMember |
Shares Outstanding Under Directors' Deferred Compensation Plan | 500,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = ddr_DirectorsPlanMember | 400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = ddr_DirectorsPlanMember |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of participant's elective deferral | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Stock options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual term of stock options, Maximum | 10 years |  |
Vesting Period | 3 years |  |
Portion of increments granted for stock options | one-third |  |
Term of increment grant | one year after the date of grant. |  |
Total unrecognized compensation cost granted | 1.9 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Term of recognition of unrecognized stock option compensation cost | 1 year 9 months 18 days |  |
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 4 years |  |
Total unrecognized compensation cost granted | 12.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Term of recognition of unrecognized stock option compensation cost | 2 years 3 months 18 days |  |
Restricted common shares | 300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 300,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Weighted-average fair value of the restricted stock | $ 17.43 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Common shares issued | 100,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 100,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 100,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock Awards [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 9.25 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Restricted Stock Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average fair value of the restricted stock | $ 16.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Performance Period [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 3 years |  |
Additional Vesting [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting Period | 4 years |  |
Absolute Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compound annual growth rate | 8.00%ddr_CompoundAnnualGrowthRate / us-gaap_AwardTypeAxis = ddr_AbsolutePerformanceAwardMember |  |
Aggregate percentage of performance awards | 1.4133%ddr_PercentageOfPerformanceAwardGrantInPeriod / us-gaap_AwardTypeAxis = ddr_AbsolutePerformanceAwardMember |  |
Absolute Performance Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards | 18.0 ddr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardValue / us-gaap_AwardTypeAxis = ddr_AbsolutePerformanceAwardMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Relative Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate percentage of performance awards | 1.9337%ddr_PercentageOfPerformanceAwardGrantInPeriod / us-gaap_AwardTypeAxis = ddr_RelativePerformanceAwardMember |  |
Relative Performance Awards [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance awards | $ 36.0 ddr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardValue / us-gaap_AwardTypeAxis = ddr_RelativePerformanceAwardMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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