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Notes Receivable - Loans Receivable on Real Estate (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Receivables [Abstract] |  |
Balance at January 1 | $ 49,488 | $ 41,988
Additions: |  |
Interest | 261 | 0
Accretion of discount | 269 | 254
Deductions: |  |
Collections of principal and interest | (134) | (126)
Balance at March 31 | $ 49,884 | $ 42,116

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- Definition Additions. + References No definition available. + Details
Name: | ddr_AdditionsAbstract
Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Collections of principal and interest. + References No definition available. + Details
Name: | ddr_CollectionsOfPrincipalAndInterest
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deductions. + References No definition available. + Details
Name: | ddr_DeductionsAbstract
Namespace Prefix: | ddr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of accretion of discount recorded on mortgage loans on real estate during the reporting period. + References No definition available. + Details
Name: | ddr_MortgageLoansOnRealEstateAccretionOfDiscount
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Mortgage loans on real estate interest. + References No definition available. + Details
Name: | ddr_MortgageLoansOnRealEstateInterest
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position related to mortgage loans receivable. + References No definition available. + Details
Name: | ddr_MortgageLoansReceivableBalance
Namespace Prefix: | ddr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration