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Summary of Significant Accounting Policies - Schedule of Company's Intangibles (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets: |  |
Above-market leases, net | $ 38.6 ddr_BusinessCombinationAboveMarketLeasesNet | $ 41.5 ddr_BusinessCombinationAboveMarketLeasesNet
Liabilities: |  |
Below-market leases, net | $ (139.3)us-gaap_BelowMarketLeaseNet | $ (123.9)us-gaap_BelowMarketLeaseNet

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- Definition Business acquisition purchase price allocation above-market leases, net. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount after amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life. + References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_OtherAssetsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_OtherLiabilitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration