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Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
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Mar. 31, 2015 Derivative | Dec. 31, 2014 Derivative
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Approximate fair value of notes | 359.0 us-gaap_NotesReceivableFairValueDisclosure | 362.2 us-gaap_NotesReceivableFairValueDisclosure
Carrying amount of notes | 354.7 ddr_CarryingAmountOfNotesReceivableAndAdvancesToAffiliates | 358.2 ddr_CarryingAmountOfNotesReceivableAndAdvancesToAffiliates
Aggregate notional amount | 79.6 invest_DerivativeNotionalAmount | 530.0 invest_DerivativeNotionalAmount
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months, net | (2.8)us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet |
Interest Rate Swaps One [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Derivative maturity date | Sep. 01, 2017 |
Derivative fixed interest rate | 2.80%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeByNatureAxis = ddr_InterestRateSwapsOneMember |
Number of interest rate derivatives held | 1 us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeByNatureAxis = ddr_InterestRateSwapsOneMember | 9 us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeByNatureAxis = ddr_InterestRateSwapsOneMember
Fair Value, Measurements, Recurring [Member] |  |
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Fair value of swap, net liability | 3.8 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 4.3 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

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- Definition Carrying amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates including those from equity method investments. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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- Details
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