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Acquisitions - Additional Information (Detail) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2017 USD ($) ShoppingCenter | Sep. 30, 2017 USD ($)
Business Acquisition [Line Items] |  |
Revenues from the date of acquisition |  | $ 5.1
Shopping Center [Member] |  |
Business Acquisition [Line Items] |  |
Number of business acquired | ShoppingCenter | 1 |
Shopping Center [Member] | Chicago, IL [Member] |  |
Business Acquisition [Line Items] |  |
Business acquisitions value | $ 81.0 |

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- Definition Business acquisition cost of acquired entity purchase price gross. + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Balance Type: |
Period Type: |