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Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
OP Units, outstanding	1,441,890us-gaap_OtherOwnershipInterestsUnitsOutstanding	398,701us-gaap_OtherOwnershipInterestsUnitsOutstanding
Common Stock Dividends Per Share [Abstract]
Common stock, dividends, per share, declared	$ 0.1725us-gaap_CommonStockDividendsPerShareDeclared	$ 0.155us-gaap_CommonStockDividendsPerShareDeclared
Senior Convertible Notes due 2040 [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Average trading price exceeds conversion price percentage	125.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_LongtermDebtTypeAxis = ddr_SeniorConvertibleNotesDueTwoZeroFourZeroMember
Senior convertible notes convertible to common shares price	$ 14.85us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ddr_SeniorConvertibleNotesDueTwoZeroFourZeroMember
Trading days, minimum	20 days
Trading days, maximum	30 days

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Maximum trading period for closing price of common stock to be issued on conversion of debt.

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Minimum trading period for closing price of common stock to be issued on conversion of debt.

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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The number of units of other ownership interests outstanding in a limited partnership or master limited partnership. Does not include limited or general partners' ownership interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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