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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense Benefit [Line Items] |  |  |
Corporate statutory rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Puerto Rico [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Corporate statutory rate | 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = country_PR | 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = country_PR | 30.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = country_PR
Puerto Rico [Member] | Rate Prior to Retroactive Increase [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Corporate statutory rate |  | 30.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = ddr_PriorTaxRateMember / dei_LegalEntityAxis = country_PR |
Puerto Rico [Member] | Increase in Statutory Rate [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Corporate statutory rate |  | 39.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate / us-gaap_IncomeTaxAuthorityAxis = ddr_UsTaxLegislationEnactedMember / dei_LegalEntityAxis = country_PR |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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