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Acquisitions - Schedule of Acquisitions Terms (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |
Transaction value at 100% | $ 407,705,000 us-gaap_BusinessCombinationConsiderationTransferred1 | $ 1,063,681,000 us-gaap_BusinessCombinationConsiderationTransferred1
Gain on Sale and Change in Control of Interests | 4,296,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 19,906,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Blackstone I Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Date acquired |  | 2013-10
Number of centers |  | 30 ddr_NumberOfRealEstatePropertiesAcquired / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Transaction value at 100% |  | 1,550,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Mortgage debt assumed at 95% (face value) |  | 792,900,000 ddr_NonCashFaceValueOfDebtAssumed / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Mortgage debt repaid at closing |  | 139,000,000 ddr_MortgageDebtAssumedRepaidAtClosing / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Mortgage debt repaid subsequent to closing |  | 256,000,000 ddr_MortgageDebtAssumedRepaid / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
DDR preferred equity interest repaid to DDR |  | 128,400,000 ddr_PreferredEquityInterestRepaid / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
DDR mezzanine loan repaid to DDR |  | 31,700,000 ddr_MezzanineLoanRepaid / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Gain on Sale and Change in Control of Interests |  | 18,800,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneOneAcquisitionMember
Blackstone II Acquisition [Member] |  |
Business Acquisition [Line Items] |  |
Date acquired | 2014-09 |
Number of centers | 7 ddr_NumberOfRealEstatePropertiesAcquired / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |
Transaction value at 100% | 395,300,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |
Mortgage debt assumed at 95% (face value) | 233,300,000 ddr_NonCashFaceValueOfDebtAssumed / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |
Mortgage debt repaid at closing | 28,000,000 ddr_MortgageDebtAssumedRepaidAtClosing / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |
DDR preferred equity interest repaid to DDR | 31,200,000 ddr_PreferredEquityInterestRepaid / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |
Gain on Sale and Change in Control of Interests | $ 4,000,000 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_BusinessAcquisitionAxis = ddr_BlackstoneTwoAcquisitionMember |

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- Definition Business acquisition, date of acquisition. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of mezzanine loan repaid to the acquirer as part of the consideration transferred in a business acquisition. + References No definition available. + Details
Name: | ddr_MezzanineLoanRepaid
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of mortgage indebtedness repaid by the acquirer subsequent to the closing of the acquisition. + References No definition available. + Details
Name: | ddr_MortgageDebtAssumedRepaid
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of mortgage indebtedness repaid by the acquirer at the closing of the acquisition. + 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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- Definition The amount represents the face value of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash acquisition. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of real estate properties acquired. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of preferred equity interest repaid to the acquirer as part of the consideration transferred in a business acquisition. + References No definition available. + Details
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Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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Balance Type: | credit
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- Details
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- Details
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