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Nature of Business and Financial Statement Presentation - Non-cash Investing and Financing Activities (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]      
Mortgages assumed from acquisitions $ 33,700,000us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1 $ 0us-gaap_NoncashOrPartNoncashAcquisitionDebtAssumed1  
Elimination of the previously held equity interest in unconsolidated joint ventures acquired 1,400,000ddr_ReversalOfPreviouslyHeldEquityInterestRecordedInInvestmentsAndAdvancesToJointVentures 0ddr_ReversalOfPreviouslyHeldEquityInterestRecordedInInvestmentsAndAdvancesToJointVentures  
Accounts payable related to construction in progress 27,300,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 18,300,000us-gaap_CapitalExpendituresIncurredButNotYetPaid  
Dividends declared $ 67,865,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 62,300,000us-gaap_DividendsPayableCurrentAndNoncurrent $ 61,468,000us-gaap_DividendsPayableCurrentAndNoncurrent