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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Expense Benefit [Line Items] |  |  |
Other | $ 14,745 us-gaap_IncomeTaxReconciliationOtherAdjustments | $ 9,268 us-gaap_IncomeTaxReconciliationOtherAdjustments | $ 2,755 us-gaap_IncomeTaxReconciliationOtherAdjustments
TRS [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Statutory rate applied to pre-tax income (loss) | 4,115 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 2,280 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (5,757)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Effect of state and local income taxes, net of federal tax benefit | 605 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 335 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (847)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Valuation allowance (decrease) increase | (6,144)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (1,725)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 16,808 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Other | 1,424 us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (890)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | (10,204)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total expense | 0 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Effective tax rate | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Puerto Rico [Member] |  |  |
Income Tax Expense Benefit [Line Items] |  |  |
Statutory rate applied to pre-tax income (loss) | (4,306)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember | (3,869)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember | (5,921)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember
Valuation allowance (decrease) increase | 4,194 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = ddr_PuertoRicoMember | 6,714 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = ddr_PuertoRicoMember | 7,049 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = ddr_PuertoRicoMember
Statutory rate increase | 0 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember | (2,189)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember | 0 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate / dei_LegalEntityAxis = ddr_PuertoRicoMember
Other | 112 us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = ddr_PuertoRicoMember | 17 us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = ddr_PuertoRicoMember | (1,128)us-gaap_IncomeTaxReconciliationOtherAdjustments / dei_LegalEntityAxis = ddr_PuertoRicoMember
Total expense | $ 0 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember | $ 673 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember | $ 0 ddr_IncomeTaxesExpenseBenefitContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember
Effective tax rate | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember | (6.79%)us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember | 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / dei_LegalEntityAxis = ddr_PuertoRicoMember

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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