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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 | 1,441,890 us-gaap_OtherOwnershipInterestsUnitsOutstanding | 398,701 us-gaap_OtherOwnershipInterestsUnitsOutstanding
Common Stock Dividends Per Share [Abstract] |  |
Common stock, dividends, per share, declared | $ 0.1725 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.155 us-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 | $ 14.85 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = ddr_SeniorConvertibleNotesDueTwoZeroFourZeroMember |
Trading days, minimum | 20 days |
Trading days, maximum | 30 days |

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- Definition Maximum trading period for closing price of common stock to be issued on conversion of debt. + References No definition available. + Details
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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 + Details
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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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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