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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Assets or Investments (Parenthetical) (Detail) - ShoppingCenter | Dec. 31, 2016 | Dec. 31, 2015
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Operating Shopping Centers [Member] |  |
Schedule Of Investments [Line Items] |  |
Number of properties | 20 | 25

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=ddr_OperatingAssetsImpairedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |