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Mortgage Loans on Real Estate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Mortgage Loans On Real Estate [Line Items]  
Prior Liens $ 1,355,113us-gaap_MortgageLoansOnRealEstatePriorLiens1
Face Amount of Mortgages 374,490us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Carrying Amount of Mortgages 357,754us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
Principal Amount of Loans Subject to Delinquent Principal or Interest 20,149us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
Senior Loans and Mezzanine Loans [Member]  
Mortgage Loans On Real Estate [Line Items]  
Prior Liens 118,316us-gaap_MortgageLoansOnRealEstatePriorLiens1
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= ddr_SeniorLoansAndMezzanineLoansMember
Face Amount of Mortgages 74,490us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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= ddr_SeniorLoansAndMezzanineLoansMember
Carrying Amount of Mortgages 52,444us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_SeniorLoansAndMezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 20,149us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ddr_SeniorLoansAndMezzanineLoansMember
Mezzanine Loans | Retail | Borrower C [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate 10.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerCMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ddr_RetailMember
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= ddr_MezzanineLoansMember
Final Maturity Date Nov-22
Periodic Payment Terms I
Prior Liens 59,000us-gaap_MortgageLoansOnRealEstatePriorLiens1
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Face Amount of Mortgages 4,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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= ddr_MezzanineLoansMember
Carrying Amount of Mortgages 4,539us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_MezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_CounterpartyNameAxis
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= ddr_RetailMember
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= ddr_MezzanineLoansMember
Mezzanine Loans | Retail | Borrower D [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate 9.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerDMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= ddr_RetailMember
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= ddr_MezzanineLoansMember
Final Maturity Date Jun-23
Periodic Payment Terms I
Prior Liens 20,500us-gaap_MortgageLoansOnRealEstatePriorLiens1
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Face Amount of Mortgages 7,500us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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Carrying Amount of Mortgages 7,541us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_MezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerDMember
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= ddr_RetailMember
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= ddr_MezzanineLoansMember
Mezzanine Loans | Retail | Borrower E [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate LIBOR+8.0%,Floor 12%
Final Maturity Date on demand (loan in default)
Periodic Payment Terms I
Prior Liens 12,816us-gaap_MortgageLoansOnRealEstatePriorLiens1
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= ddr_BorrowerEMember
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= ddr_RetailMember
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= ddr_MezzanineLoansMember
Face Amount of Mortgages 10,806us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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Carrying Amount of Mortgages 0us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_MezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 10,806us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
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= ddr_BorrowerEMember
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= ddr_RetailMember
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= ddr_MezzanineLoansMember
Mezzanine Loans | Multi-family [Member] | Borrower B [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate LIBOR+6.0%,Floor 11%
Final Maturity Date Feb-17
Periodic Payment Terms I
Prior Liens 26,000us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerBMember
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= ddr_MezzanineLoansMember
Face Amount of Mortgages 5,868us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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Carrying Amount of Mortgages 5,923us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_BorrowerBMember
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= ddr_MultiFamilyMember
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= ddr_MezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
/ us-gaap_CounterpartyNameAxis
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= ddr_MezzanineLoansMember
Mezzanine Loans | Mixed Use [Member] | Borrower F [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate LIBOR+10.0%,Floor 14%
Final Maturity Date on demand(loan in default)
Periodic Payment Terms I
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerFMember
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= ddr_MezzanineLoansMember
Face Amount of Mortgages 12,816us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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= ddr_MezzanineLoansMember
Carrying Amount of Mortgages 5,026us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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= ddr_MezzanineLoansMember
Principal Amount of Loans Subject to Delinquent Principal or Interest 9,343us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
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= ddr_MezzanineLoansMember
Investments in and Advances to Joint Ventures [Member] | Borrower G  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate 8.50%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_CounterpartyNameAxis
= ddr_BorrowerGMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= ddr_InvestmentsAndAdvancesToJointVenturesMember
Final Maturity Date Oct-21
Periodic Payment Terms QI
Prior Liens 1,236,797us-gaap_MortgageLoansOnRealEstatePriorLiens1
/ us-gaap_CounterpartyNameAxis
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Face Amount of Mortgages 300,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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= ddr_BorrowerGMember
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= ddr_InvestmentsAndAdvancesToJointVenturesMember
Carrying Amount of Mortgages 305,310us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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Principal Amount of Loans Subject to Delinquent Principal or Interest 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
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= ddr_BorrowerGMember
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= ddr_InvestmentsAndAdvancesToJointVenturesMember
Senior Loans [Member] | Retail | Borrower A [Member]  
Mortgage Loans On Real Estate [Line Items]  
Interest Rate 5.73%us-gaap_MortgageLoansOnRealEstateInterestRate
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= ddr_BorrowerAMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_SeniorLoansMember
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= ddr_RetailMember
Final Maturity Date Sep-17
Periodic Payment Terms P&I
Prior Liens 0us-gaap_MortgageLoansOnRealEstatePriorLiens1
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Face Amount of Mortgages 33,000us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
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Carrying Amount of Mortgages 29,415us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages
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Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0us-gaap_MortgageLoansOnRealEstatePrincipalAmountOfDelinquentLoans
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