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Income Taxes (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Taxable Distributions Paid Per Common Share [Abstract]      
Ordinary income $ 0.695udr_TaxableDistributionsPaidPerCommonShareOrdinaryIncome $ 0.744udr_TaxableDistributionsPaidPerCommonShareOrdinaryIncome $ 0.174udr_TaxableDistributionsPaidPerCommonShareOrdinaryIncome
Taxable Distributions Paid Per Common Share Qualified Ordinary Income $ 0.139udr_TaxableDistributionsPaidPerCommonShareQualifiedOrdinaryIncome $ 0.000udr_TaxableDistributionsPaidPerCommonShareQualifiedOrdinaryIncome $ 0.000udr_TaxableDistributionsPaidPerCommonShareQualifiedOrdinaryIncome
Long-term capital gain $ 0.105udr_TaxableDistributionsPaidPerCommonShareLongTermCapitalGain $ 0.114udr_TaxableDistributionsPaidPerCommonShareLongTermCapitalGain $ 0.186udr_TaxableDistributionsPaidPerCommonShareLongTermCapitalGain
Unrecapture section 1250 gain $ 0.076udr_TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain $ 0.067udr_TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain $ 0.515udr_TaxableDistributionsPaidPerCommonShareUnrecaptureSectionGain
Taxable distributions per common share $ 1.02us-gaap_CommonStockDividendsPerShareCashPaid $ 0.93us-gaap_CommonStockDividendsPerShareCashPaid $ 0.88us-gaap_CommonStockDividendsPerShareCashPaid