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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred tax assets:      
Federal and state tax attributes $ 0udr_DeferredTaxAssetsFederalAndStateTaxAttributes $ 13,069udr_DeferredTaxAssetsFederalAndStateTaxAttributes $ 1,464udr_DeferredTaxAssetsFederalAndStateTaxAttributes
Book/tax depreciation 6,692udr_DeferredTaxAssetsDepreciation 19,354udr_DeferredTaxAssetsDepreciation 12,345udr_DeferredTaxAssetsDepreciation
Construction capitalization differences 75udr_DeferredTaxAssetsAssetCapitalizationDifferences 0udr_DeferredTaxAssetsAssetCapitalizationDifferences 6,635udr_DeferredTaxAssetsAssetCapitalizationDifferences
Investment in partnerships 0us-gaap_DeferredTaxAssetsEquityMethodInvestments 0us-gaap_DeferredTaxAssetsEquityMethodInvestments 3,112us-gaap_DeferredTaxAssetsEquityMethodInvestments
Debt and interest deductions 0udr_DeferredTaxAssetDebtAndInterestDeductions 10,311udr_DeferredTaxAssetDebtAndInterestDeductions 0udr_DeferredTaxAssetDebtAndInterestDeductions
Other 401us-gaap_DeferredTaxAssetsOther 0us-gaap_DeferredTaxAssetsOther 2,009us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 7,168us-gaap_DeferredTaxAssetsGross 42,734us-gaap_DeferredTaxAssetsGross 25,565us-gaap_DeferredTaxAssetsGross
Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance (1,310)us-gaap_DeferredTaxAssetsValuationAllowance (1,390)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 7,168us-gaap_DeferredTaxAssetsNet 41,424us-gaap_DeferredTaxAssetsNet 24,175us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts (3,766)us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts 0us-gaap_DeferredTaxLiabilitiesDeferredExpenseOtherCapitalizedCosts
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates 0us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (5,080)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 0us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Deferred tax liabilities:      
Other (192)us-gaap_DeferredTaxLiabilitiesOther (305)us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (192)us-gaap_DeferredIncomeTaxLiabilities (9,151)us-gaap_DeferredIncomeTaxLiabilities 0us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax asset $ 6,976us-gaap_DeferredTaxAssetsLiabilitiesNet $ 32,273us-gaap_DeferredTaxAssetsLiabilitiesNet $ 24,175us-gaap_DeferredTaxAssetsLiabilitiesNet