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Quarterly Results of Operations - Summary of Quarterly Results of Operations (Parenthetical) (Detail) $ in Millions | 3 Months Ended
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Dec. 31, 2014 USD ($)
Quarterly Financial Information Disclosure [Abstract] |
Impairment charges | $ 32.6

X
- Definition Amount of write-down of assets recognized into earnings included in continuing operations and discontinued operations and the equity method investment other than temporary impairment. + 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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- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration