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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
TRS [Member] |
Income Tax Expense Benefit [Line Items] |
Deferred tax impact of federal rate change | $ 19.4

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- Definition Amount of overall deferred tax impact of federal rate change. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Income tax expense benefit. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |