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Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Derivative	Dec. 31, 2014 Derivative
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Approximate fair value of notes	359.0us-gaap_NotesReceivableFairValueDisclosure	362.2us-gaap_NotesReceivableFairValueDisclosure
Carrying amount of notes	354.7ddr_CarryingAmountOfNotesReceivableAndAdvancesToAffiliates	358.2ddr_CarryingAmountOfNotesReceivableAndAdvancesToAffiliates
Aggregate notional amount	79.6invest_DerivativeNotionalAmount	530.0invest_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	1us-gaap_NumberOfInterestRateDerivativesHeld / us-gaap_DerivativeByNatureAxis = ddr_InterestRateSwapsOneMember	9us-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	3.8us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	4.3us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

X

- 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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Namespace Prefix:	ddr_
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Balance Type:	debit
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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X

- 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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X

- 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

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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

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