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Other Assets, Net - Components of Other Assets (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Other Assets [Abstract] |  |  |  |
Amortization expense | $ 16.0 | $ 21.3 | $ 32.6 | $ 40.8

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- Definition Amortization of intangible assets excluding above and below market leases. + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration