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Subsequent Events - Additional Information (Detail) (Subsequent Events [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended
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Jan. 31, 2015
3.625% Senior Unsecured Notes Due February 2025 [Member] |
Subsequent Event [Line Items] |
Proceeds from unsecured notes payable | $ 500.0 us-gaap_ProceedsFromUnsecuredNotesPayable / us-gaap_DebtInstrumentAxis = ddr_ThreePointSixTwoFivePercentSeniorUnsecuredNotesDueFebruaryTwentyTwentyFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Debt Instrument, Stated Percentage | 3.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = ddr_ThreePointSixTwoFivePercentSeniorUnsecuredNotesDueFebruaryTwentyTwentyFiveMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Debt Instrument Maturity Date | 2025-02
Unsecured Term Loan [Member] |
Subsequent Event [Line Items] |
Repayments of term loan | 350.0 us-gaap_RepaymentsOfOtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_UnsecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Secured Term Loan [Member] |
Subsequent Event [Line Items] |
Repayments of term loan | $ 100.0 us-gaap_RepaymentsOfOtherLongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SecuredDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Definition Debt Instruments Maturity Date, Month and Year + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition The cash inflow from borrowings supported by a written promise to pay an obligation that is uncollateralized (where debt is not backed by the pledge of collateral). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration