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Notes Receivable - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 SecurityLoan | Dec. 31, 2013 SecurityLoan | Dec. 31, 2012
Receivables [Abstract] |  |  |
Number of loans receivable outstanding | 6 us-gaap_MortgageLoansOnRealEstateNumberOfLoans | 7 us-gaap_MortgageLoansOnRealEstateNumberOfLoans |
Principal amount of loans subject to delinquent principal or interest | $ 9,800,000 ddr_MaturedLoansOutstanding |  |
Number of matured loans outstanding | 1 ddr_NumberOfMaturedLoansOutstanding |  |
Past due on interest payments | more than 90 days |  |
Number of mortgage loans on real estate fully reserved | 1 ddr_NumberOfMortgageLoansOnRealEstateFullyReserved |  |
Loan loss reserve | $ 500,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | $ 0 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 | $ 4,300,000 us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1

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- Definition Amount of matured loans outstanding at the balance sheet date. + References No definition available. + Details
Name: | ddr_MaturedLoansOutstanding
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Mortgage loan on real estate period delinquent. + References No definition available. + Details
Name: | ddr_MortgageLoanOnRealEstatePeriodDelinquent
Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of mortgage loans receivable that have matured at the balance sheet date. + References No definition available. + Details
Name: | ddr_NumberOfMaturedLoansOutstanding
Namespace Prefix: | ddr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of mortgage loans receivable that are fully reserved at the balance sheet date. + References No definition available. + Details
Name: | ddr_NumberOfMortgageLoansOnRealEstateFullyReserved
Namespace Prefix: | ddr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of reserve for write-down of a mortgage loan on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.7) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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