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This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A7 -Appendix A Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. true2Net (loss)/income attributable to Entity40true 4us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDilutedAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Loss per OP unit- basic and diluted:41false 5us-gaap_IncomeLossFromContinuingOperationsPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDilutedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse0.060.06USD$falsetruefalse2truefalsefalse-0.01-0.01USD$falsetruefalse3truefalsefalse0.100.10USD$falsetruefalse4truefalsefalse-0.05-0.05USD$falsetruefalsenum:perShareItemTypedecimalThe amount of net income (loss) from continuing operations per each basic and diluted limited partnership and general partnership unit when the per unit amount is the same for both basic and diluted units.No definition available.false3Loss from continuing operations attributable to OP unitholders (in dollars per share)42false 5us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDilutedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse0.000.00USD$falsetruefalse2truefalsefalse0.290.29USD$falsetruefalse3truefalsefalse0.000.00USD$falsetruefalse4truefalsefalse0.290.29USD$falsetruefalsenum:perShareItemTypedecimalThe amount of income (loss) derived from discontinued operations during the period, net of related tax effect, per each basic and diluted limited partnership and general partnership unit when the per unit amount is the same for both basic and diluted units.No definition available.false3Income from discontinued operations (in dollars per share)43false 5us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipAndGeneralPartnershipUnitBasicAndDilutedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse0.060.06USD$falsetruefalse2truefalsefalse0.280.28USD$falsetruefalse3truefalsefalse0.100.10USD$falsetruefalse4truefalsefalse0.240.24USD$falsetruefalsenum:perShareItemTypedecimalThe amount of net income or loss for the period per each limited partnership and general partnership unit in instances when basic and diluted earnings per unit are the same amount and aggregated on the face of the financial statements. Basic earnings per unit is the amount of net income or loss for the period per unit outstanding during the reporting period. Diluted earnings per unit includes the amount of net income or loss for the period available to each limited and general partnership unit outstanding during the reporting period and to each unit that would have been outstanding assuming the issuance of units for all dilutive potential units outstanding during the reporting period.No definition available.true3Net loss attributable to OP unitholders (in dollars per share)44false 4us-gaap_WeightedAverageNumberOfLimitedPartnershipAndGeneralPartnershipUnitOutstandingBasicAndDilutedus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse184281000184281falsefalsefalse2truefalsefalse184281000184281falsefalsefalse3truefalsefalse184281000184281falsefalsefalse4truefalsefalse184281000184281falsefalsefalsexbrli:sharesItemTypesharesThe average number of limited partnership and general partnership units issued and outstanding that are used in calculating basic and diluted earnings per limited partnership and general partnership unit.No definition available.false1Weighted average OP units outstandingfalseConsolidated Statements of Operations (UNITED DOMINION REALTY, L.P) (USD $)ThousandsThousandsNoRoundingUnKnowntruefalsefalseSheethttp://www.udr.com/role/ConsolidatedStatementsOfOperationsUnitedDominionRealtyLP444