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Valuation and Qualifying Accounts and Reserves (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation And Qualifying Accounts [Abstract] |  |  |
Reserve of preferred equity interests | $ 61,000 | $ 0 | $ 0

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- Definition Adjustment (reserve) of preferred equity interests. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ValuationAndQualifyingAccountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration