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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Condensed Combined Balance Sheets
Land	$ 2,208,468us-gaap_Land	$ 2,209,970us-gaap_Land
Buildings	7,087,040us-gaap_InvestmentBuildingAndBuildingImprovements	6,949,440us-gaap_InvestmentBuildingAndBuildingImprovements
Fixtures and tenant improvements	645,035us-gaap_FixturesAndEquipmentGross	599,221us-gaap_FixturesAndEquipmentGross
Total real estate rental property	9,940,543us-gaap_RealEstateInvestmentPropertyAtCost	9,758,631us-gaap_RealEstateInvestmentPropertyAtCost
Less: Accumulated depreciation	(1,909,585)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation	(1,823,199)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation
Real estate rental property, net	8,030,958us-gaap_RealEstateInvestmentPropertyNet	7,935,432us-gaap_RealEstateInvestmentPropertyNet
Land held for development and construction in progress	395,242us-gaap_DevelopmentInProcess	452,980us-gaap_DevelopmentInProcess
Total real estate assets, net	8,426,200us-gaap_RealEstateInvestments	8,401,082us-gaap_RealEstateInvestments
Other assets	451,442us-gaap_OtherAssets	477,868us-gaap_OtherAssets
Total assets	9,541,895us-gaap_Assets	9,693,073us-gaap_Assets
Mortgage debt	1,689,805us-gaap_NotesAndLoansPayable	1,761,421us-gaap_NotesAndLoansPayable
Total liabilities	5,744,367us-gaap_Liabilities	5,765,194us-gaap_Liabilities
Total liabilities and equity	9,541,895us-gaap_LiabilitiesAndStockholdersEquity	9,693,073us-gaap_LiabilitiesAndStockholdersEquity
Company's share of Accumulated Equity	122,937ddr_CompanysShareInAccumulatedEquityOfUnconsolidatedJointVentures	365,297ddr_CompanysShareInAccumulatedEquityOfUnconsolidatedJointVentures
Unconsolidated Joint Ventures [Member]
Condensed Combined Balance Sheets
Land	1,439,849us-gaap_Land / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	1,275,232us-gaap_Land / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Buildings	3,854,585us-gaap_InvestmentBuildingAndBuildingImprovements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	3,940,806us-gaap_InvestmentBuildingAndBuildingImprovements / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Fixtures and tenant improvements	200,696us-gaap_FixturesAndEquipmentGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	266,851us-gaap_FixturesAndEquipmentGross / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Total real estate rental property	5,495,130us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	5,482,889us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Less: Accumulated depreciation	(773,256)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	(839,867)us-gaap_RealEstateInvestmentPropertyAccumulatedDepreciation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Real estate rental property, net	4,721,874us-gaap_RealEstateInvestmentPropertyNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	4,643,022us-gaap_RealEstateInvestmentPropertyNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Land held for development and construction in progress	55,698us-gaap_DevelopmentInProcess / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	116,088us-gaap_DevelopmentInProcess / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Total real estate assets, net	4,777,572us-gaap_RealEstateInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	4,759,110us-gaap_RealEstateInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Cash and restricted cash	100,812ddr_CashAndRestrictedCash / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	282,866ddr_CashAndRestrictedCash / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Receivables, net	80,508us-gaap_AccountsAndNotesReceivableNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	101,003us-gaap_AccountsAndNotesReceivableNet / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Other assets	394,751us-gaap_OtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	196,615us-gaap_OtherAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Total assets	5,353,643us-gaap_Assets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	5,339,594us-gaap_Assets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Mortgage debt	3,552,764us-gaap_NotesAndLoansPayable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	3,282,643us-gaap_NotesAndLoansPayable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Notes and accrued interest payable to DDR	144,831ddr_NotesAndAccruedInterestPayableToParentCompany / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	127,679ddr_NotesAndAccruedInterestPayableToParentCompany / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Other liabilities	276,998us-gaap_OtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	245,368us-gaap_OtherLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Total liabilities	3,974,593us-gaap_Liabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	3,655,690us-gaap_Liabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Redeemable preferred equity	305,310us-gaap_RedeemableNoncontrollingInterestEquityPreferredCarryingAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	71,771us-gaap_RedeemableNoncontrollingInterestEquityPreferredCarryingAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Accumulated equity	1,073,740us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	1,612,133us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember
Total liabilities and equity	$ 5,353,643us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember	$ 5,339,594us-gaap_LiabilitiesAndStockholdersEquity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = ddr_UnconsolidatedJointVenturesMember

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