3.10.0.1 html 702 407 1 false 147 0 false 12 false false R1.htm 10001000 - Document - Document and Entity Information Sheet http://www.udr.com/20170331/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 11001000 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.udr.com/20170331/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 11001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.udr.com/20170331/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 11002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 11003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfComprehensiveIncomeLoss CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) Statements 5 false false R6.htm 11004000 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN EQUITY Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementOfChangesInEquity CONSOLIDATED STATEMENT OF CHANGES IN EQUITY Statements 6 false false R7.htm 11004501 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementOfChangesInEquityParenthetical CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) Statements 7 false false R8.htm 11005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 11005501 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfCashFlowsSupplemental CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL Statements 9 false false R10.htm 11005502 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfCashFlowsParenthetical CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Statements 10 false false R11.htm 12101100 - Disclosure - BASIS OF PRESENTATION Sheet http://www.udr.com/20170331/role/DisclosureBasisOfPresentation BASIS OF PRESENTATION Notes 11 false false R12.htm 12102100 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPolicies SIGNIFICANT ACCOUNTING POLICIES Notes 12 false false R13.htm 12103100 - Disclosure - REAL ESTATE OWNED Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwned REAL ESTATE OWNED Notes 13 false false R14.htm 12104100 - Disclosure - VARIABLE INTEREST ENTITIES Sheet http://www.udr.com/20170331/role/DisclosureVariableInterestEntities VARIABLE INTEREST ENTITIES Notes 14 false false R15.htm 12105100 - Disclosure - JOINT VENTURES AND PARTNERSHIPS Sheet http://www.udr.com/20170331/role/DisclosureJointVenturesAndPartnerships JOINT VENTURES AND PARTNERSHIPS Notes 15 false false R16.htm 12106100 - Disclosure - SECURED AND UNSECURED DEBT, NET Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNet SECURED AND UNSECURED DEBT, NET Notes 16 false false R17.htm 12107100 - Disclosure - INCOME/(LOSS) PER SHARE Sheet http://www.udr.com/20170331/role/DisclosureIncomeLossPerShare INCOME/(LOSS) PER SHARE Notes 17 false false R18.htm 12108100 - Disclosure - NONCONTROLLING INTERESTS Sheet http://www.udr.com/20170331/role/DisclosureNoncontrollingInterests NONCONTROLLING INTERESTS Notes 18 false false R19.htm 12109100 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstruments FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS Notes 19 false false R20.htm 12110100 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivity DERIVATIVES AND HEDGING ACTIVITY Notes 20 false false R21.htm 12111100 - Disclosure - STOCK BASED COMPENSATION Sheet http://www.udr.com/20170331/role/DisclosureStockBasedCompensation STOCK BASED COMPENSATION Notes 21 false false R22.htm 12112100 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 22 false false R23.htm 12113100 - Disclosure - REPORTABLE SEGMENTS Sheet http://www.udr.com/20170331/role/DisclosureReportableSegments REPORTABLE SEGMENTS Notes 23 false false R24.htm 12202202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 24 false false R25.htm 12302303 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesTables SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://www.udr.com/20170331/role/DisclosureSignificantAccountingPolicies 25 false false R26.htm 12303303 - Disclosure - REAL ESTATE OWNED (Tables) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedTables REAL ESTATE OWNED (Tables) Tables http://www.udr.com/20170331/role/DisclosureRealEstateOwned 26 false false R27.htm 12305303 - Disclosure - JOINT VENTURES AND PARTNERSHIPS (Tables) Sheet http://www.udr.com/20170331/role/DisclosureJointVenturesAndPartnershipsTables JOINT VENTURES AND PARTNERSHIPS (Tables) Tables http://www.udr.com/20170331/role/DisclosureJointVenturesAndPartnerships 27 false false R28.htm 12306303 - Disclosure - SECURED AND UNSECURED DEBT, NET (Tables) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetTables SECURED AND UNSECURED DEBT, NET (Tables) Tables http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNet 28 false false R29.htm 12307303 - Disclosure - INCOME/(LOSS) PER SHARE (Tables) Sheet http://www.udr.com/20170331/role/DisclosureIncomeLossPerShareTables INCOME/(LOSS) PER SHARE (Tables) Tables http://www.udr.com/20170331/role/DisclosureIncomeLossPerShare 29 false false R30.htm 12308303 - Disclosure - NONCONTROLLING INTERESTS (Tables) Sheet http://www.udr.com/20170331/role/DisclosureNoncontrollingInterestsTables NONCONTROLLING INTERESTS (Tables) Tables http://www.udr.com/20170331/role/DisclosureNoncontrollingInterests 30 false false R31.htm 12309303 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Tables) Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsTables FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Tables) Tables http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstruments 31 false false R32.htm 12310303 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (Tables) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityTables DERIVATIVES AND HEDGING ACTIVITY (Tables) Tables http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivity 32 false false R33.htm 12312303 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingencies 33 false false R34.htm 12313303 - Disclosure - REPORTABLE SEGMENTS (Tables) Sheet http://www.udr.com/20170331/role/DisclosureReportableSegmentsTables REPORTABLE SEGMENTS (Tables) Tables http://www.udr.com/20170331/role/DisclosureReportableSegments 34 false false R35.htm 12401401 - Disclosure - BASIS OF PRESENTATION (Details) Sheet http://www.udr.com/20170331/role/DisclosureBasisOfPresentationDetails BASIS OF PRESENTATION (Details) Details http://www.udr.com/20170331/role/DisclosureBasisOfPresentation 35 false false R36.htm 12402401 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesRevenueRecognitionDetails SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) Details 36 false false R37.htm 12402402 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Disaggregation (Details) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesDisaggregationDetails SIGNIFICANT ACCOUNTING POLICIES - Disaggregation (Details) Details 37 false false R38.htm 12402403 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesDetails SIGNIFICANT ACCOUNTING POLICIES (Details) Details http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesTables 38 false false R39.htm 12403401 - Disclosure - REAL ESTATE OWNED - Summarizes the carrying amounts for our real estate owned (Details) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedSummarizesCarryingAmountsForOurRealEstateOwnedDetails REAL ESTATE OWNED - Summarizes the carrying amounts for our real estate owned (Details) Details 39 false false R40.htm 12403402 - Disclosure - REAL ESTATE OWNED - Acquisitions and Dispositions (Details) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedAcquisitionsAndDispositionsDetails REAL ESTATE OWNED - Acquisitions and Dispositions (Details) Details 40 false false R41.htm 12405401 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Summary (Details) Sheet http://www.udr.com/20170331/role/DisclosureJointVenturesAndPartnershipsSummaryDetails JOINT VENTURES AND PARTNERSHIPS - Summary (Details) Details 41 false false R42.htm 12405402 - Disclosure - JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) Sheet http://www.udr.com/20170331/role/DisclosureJointVenturesAndPartnershipsCommitmentsDetails JOINT VENTURES AND PARTNERSHIPS - Commitments (Details) Details 42 false false R43.htm 12406401 - Disclosure - SECURED AND UNSECURED DEBT, NET - Summary (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetSummaryDetails SECURED AND UNSECURED DEBT, NET - Summary (Details) Details 43 false false R44.htm 12406402 - Disclosure - SECURED AND UNSECURED DEBT, NET - Variable Rate Debt (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetVariableRateDebtDetails SECURED AND UNSECURED DEBT, NET - Variable Rate Debt (Details) Details 44 false false R45.htm 12406403 - Disclosure - SECURED AND UNSECURED DEBT, NET - Credit Facilities (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetCreditFacilitiesDetails SECURED AND UNSECURED DEBT, NET - Credit Facilities (Details) Details 45 false false R46.htm 12406404 - Disclosure - SECURED AND UNSECURED DEBT, NET - Short Term Debt (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetShortTermDebtDetails SECURED AND UNSECURED DEBT, NET - Short Term Debt (Details) Details 46 false false R47.htm 12406405 - Disclosure - SECURED AND UNSECURED DEBT, NET - Unsecured Maturities (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetUnsecuredMaturitiesDetails SECURED AND UNSECURED DEBT, NET - Unsecured Maturities (Details) Details 47 false false R48.htm 12406406 - Disclosure - SECURED AND UNSECURED DEBT, NET - Debt Covenants (Details) Sheet http://www.udr.com/20170331/role/DisclosureSecuredAndUnsecuredDebtNetDebtCovenantsDetails SECURED AND UNSECURED DEBT, NET - Debt Covenants (Details) Details 48 false false R49.htm 12407401 - Disclosure - INCOME/(LOSS) PER SHARE (Details) Sheet http://www.udr.com/20170331/role/DisclosureIncomeLossPerShareDetails INCOME/(LOSS) PER SHARE (Details) Details http://www.udr.com/20170331/role/DisclosureIncomeLossPerShareTables 49 false false R50.htm 12408401 - Disclosure - NONCONTROLLING INTERESTS (Details) Sheet http://www.udr.com/20170331/role/DisclosureNoncontrollingInterestsDetails NONCONTROLLING INTERESTS (Details) Details http://www.udr.com/20170331/role/DisclosureNoncontrollingInterestsTables 50 false false R51.htm 12409401 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Details) Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsDetails FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (Details) Details http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsTables 51 false false R52.htm 12410401 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityInterestRateDerivativesDetails DERIVATIVES AND HEDGING ACTIVITY - Interest Rate Derivatives (Details) Details 52 false false R53.htm 12410402 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Undesignated Interest Rate Derivatives (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityUndesignatedInterestRateDerivativesDetails DERIVATIVES AND HEDGING ACTIVITY - Undesignated Interest Rate Derivatives (Details) Details 53 false false R54.htm 12410403 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Fair Value (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityFairValueDetails DERIVATIVES AND HEDGING ACTIVITY - Fair Value (Details) Details 54 false false R55.htm 12410404 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Offsetting Assets and Liabilities (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityOffsettingAssetsAndLiabilitiesDetails DERIVATIVES AND HEDGING ACTIVITY - Offsetting Assets and Liabilities (Details) Details 55 false false R56.htm 12410405 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY - Effectiveness (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityEffectivenessDetails DERIVATIVES AND HEDGING ACTIVITY - Effectiveness (Details) Details 56 false false R57.htm 12411401 - Disclosure - STOCK BASED COMPENSATION (Details) Sheet http://www.udr.com/20170331/role/DisclosureStockBasedCompensationDetails STOCK BASED COMPENSATION (Details) Details http://www.udr.com/20170331/role/DisclosureStockBasedCompensation 57 false false R58.htm 12412401 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingenciesTables 58 false false R59.htm 12413401 - Disclosure - REPORTABLE SEGMENTS (Details) Sheet http://www.udr.com/20170331/role/DisclosureReportableSegmentsDetails REPORTABLE SEGMENTS (Details) Details http://www.udr.com/20170331/role/DisclosureReportableSegmentsTables 59 false false R60.htm 21001000 - Statement - CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/StatementConsolidatedBalanceSheetsUnitedDominionRealtyLp CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) Uncategorized 60 false false R61.htm 21001501 - Statement - CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) (Parenthetical) Sheet http://www.udr.com/20170331/role/StatementConsolidatedBalanceSheetsUnitedDominionRealtyLpParenthetical CONSOLIDATED BALANCE SHEETS (UNITED DOMINION REALTY, L.P.) (Parenthetical) Uncategorized 61 false false R62.htm 21002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfOperationsUnauditedUnitedDominionRealtyLp CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (UNITED DOMINION REALTY, L.P.) Uncategorized 62 false false R63.htm 21003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfComprehensiveIncomeLossUnitedDominionRealtyLp CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (UNITED DOMINION REALTY, L.P.) Uncategorized 63 false false R64.htm 21004000 - Statement - CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL (UNITED DOMINION REALTY, L.P.) (Unaudited) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementOfChangesInCapitalUnitedDominionRealtyLpUnaudited CONSOLIDATED STATEMENT OF CHANGES IN CAPITAL (UNITED DOMINION REALTY, L.P.) (Unaudited) Uncategorized 64 false false R65.htm 21005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (UNITED DOMINION REALTY, L.P.) (Unaudited) Sheet http://www.udr.com/20170331/role/StatementConsolidatedStatementsOfCashFlowsUnitedDominionRealtyLpUnaudited CONSOLIDATED STATEMENTS OF CASH FLOWS (UNITED DOMINION REALTY, L.P.) (Unaudited) Uncategorized 65 false false R66.htm 21005001 - Statement - CASH FLOWS - SUPPLEMENTAL (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/StatementCashFlowsSupplementalUnitedDominionRealtyLp CASH FLOWS - SUPPLEMENTAL (UNITED DOMINION REALTY, L.P.) Uncategorized 66 false false R67.htm 22101100 - Disclosure - CONSOLIDATION AND BASIS OF PRESENTATION (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureConsolidationAndBasisOfPresentationUnitedDominionRealtyLp CONSOLIDATION AND BASIS OF PRESENTATION (UNITED DOMINION REALTY, L.P.) Uncategorized 67 false false R68.htm 22102100 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesUnitedDominionRealtyLp SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) Uncategorized 68 false false R69.htm 22103100 - Disclosure - REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedUnitedDominionRealtyLp REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) Uncategorized 69 false false R70.htm 22104100 - Disclosure - UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureUnconsolidatedEntitiesUnitedDominionRealtyLp UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) Uncategorized 70 false false R71.htm 22105100 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLp DEBT, NET (UNITED DOMINION REALTY, L.P.) Uncategorized 71 false false R72.htm 22106100 - Disclosure - RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureRelatedPartyTransactionsUnitedDominionRealtyLp RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) Uncategorized 72 false false R73.htm 22107100 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsUnitedDominionRealtyLp FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) Uncategorized 73 false false R74.htm 22108100 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityUnitedDominionRealtyLp DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) Uncategorized 74 false false R75.htm 22109100 - Disclosure - CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureCapitalStructureUnitedDominionRealtyLp CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) Uncategorized 75 false false R76.htm 22110100 - Disclosure - COMMITMENTS AND CONTINGENCIES (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureCommitmentsAndContingenciesUnitedDominionRealtyLpCommitmentsAndContingenciesUnitedDominionRealtyLp COMMITMENTS AND CONTINGENCIES (UNITED DOMINION REALTY, L.P.) Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) Uncategorized 76 false false R77.htm 22111100 - Disclosure - REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) Sheet http://www.udr.com/20170331/role/DisclosureReportableSegmentsUnitedDominionRealtyLp REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) Uncategorized 77 false false R78.htm 22202202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) (Policies) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesUnitedDominionRealtyLpPolicies SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) (Policies) Uncategorized 78 false false R79.htm 22302303 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesUnitedDominionRealtyLpTables SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 79 false false R80.htm 22303303 - Disclosure - REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedUnitedDominionRealtyLpTables REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 80 false false R81.htm 22304303 - Disclosure - UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureUnconsolidatedEntitiesUnitedDominionRealtyLpUnconsolidatedEntitiesUnitedDominionRealtyLpTables UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 81 false false R82.htm 22305303 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLpTables DEBT, NET (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 82 false false R83.htm 22307303 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsUnitedDominionRealtyLpTables FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 83 false false R84.htm 22308303 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityUnitedDominionRealtyLpTables DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 84 false false R85.htm 22309303 - Disclosure - CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) Capital Structure (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureCapitalStructureUnitedDominionRealtyLpCapitalStructureUnitedDominionRealtyLpTables CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) Capital Structure (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 85 false false R86.htm 22311303 - Disclosure - REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) (Tables) Sheet http://www.udr.com/20170331/role/DisclosureReportableSegmentsUnitedDominionRealtyLpTables REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) (Tables) Uncategorized 86 false false R87.htm 22401401 - Disclosure - CONSOLIDATION AND BASIS OF PRESENTATION - GP Units (UNITED DOMINION REALTY, L.P.) (Details) Sheet http://www.udr.com/20170331/role/DisclosureConsolidationAndBasisOfPresentationGpUnitsUnitedDominionRealtyLpDetails CONSOLIDATION AND BASIS OF PRESENTATION - GP Units (UNITED DOMINION REALTY, L.P.) (Details) Uncategorized 87 false false R88.htm 22402401 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) - Revenue Recognition (Details) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesUnitedDominionRealtyLpRevenueRecognitionDetails SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) - Revenue Recognition (Details) Uncategorized 88 false false R89.htm 22402402 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) - Disaggregation (Details) Sheet http://www.udr.com/20170331/role/DisclosureSignificantAccountingPoliciesUnitedDominionRealtyLpDisaggregationDetails SIGNIFICANT ACCOUNTING POLICIES (UNITED DOMINION REALTY, L.P.) - Disaggregation (Details) Uncategorized 89 false false R90.htm 22403401 - Disclosure - REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) - Summary (Details) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedUnitedDominionRealtyLpSummaryDetails REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) - Summary (Details) Uncategorized 90 false false R91.htm 22403402 - Disclosure - REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) - Acquisitions and Dispositions (Details) Sheet http://www.udr.com/20170331/role/DisclosureRealEstateOwnedUnitedDominionRealtyLpAcquisitionsAndDispositionsDetails REAL ESTATE OWNED (UNITED DOMINION REALTY, L.P.) - Acquisitions and Dispositions (Details) Uncategorized 91 false false R92.htm 22404401 - Disclosure - UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) - Summary Financial Information (Details) Sheet http://www.udr.com/20170331/role/DisclosureUnconsolidatedEntitiesUnitedDominionRealtyLpSummaryFinancialInformationDetails UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) - Summary Financial Information (Details) Uncategorized 92 false false R93.htm 22404402 - Disclosure - UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) - Additional Information (Details) Sheet http://www.udr.com/20170331/role/DisclosureUnconsolidatedEntitiesUnitedDominionRealtyLpAdditionalInformationDetails UNCONSOLIDATED ENTITIES (UNITED DOMINION REALTY, L.P.) - Additional Information (Details) Uncategorized 93 false false R94.htm 22405401 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) - Summary (Details) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLpSummaryDetails DEBT, NET (UNITED DOMINION REALTY, L.P.) - Summary (Details) Uncategorized 94 false false R95.htm 22405402 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) - Credit Facilities (Details) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLpCreditFacilitiesDetails DEBT, NET (UNITED DOMINION REALTY, L.P.) - Credit Facilities (Details) Uncategorized 95 false false R96.htm 22405403 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) - Maturities (Details) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLpMaturitiesDetails DEBT, NET (UNITED DOMINION REALTY, L.P.) - Maturities (Details) Uncategorized 96 false false R97.htm 22405404 - Disclosure - DEBT, NET (UNITED DOMINION REALTY, L.P.) - Additional Information (Details) Sheet http://www.udr.com/20170331/role/DisclosureDebtNetUnitedDominionRealtyLpAdditionalInformationDetails DEBT, NET (UNITED DOMINION REALTY, L.P.) - Additional Information (Details) Uncategorized 97 false false R98.htm 22406401 - Disclosure - RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) Sheet http://www.udr.com/20170331/role/DisclosureRelatedPartyTransactionsUnitedDominionRealtyLpDetails RELATED PARTY TRANSACTIONS (UNITED DOMINION REALTY, L.P.) (Details) Uncategorized 98 false false R99.htm 22407401 - Disclosure - FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) (Details) Sheet http://www.udr.com/20170331/role/DisclosureFairValueOfDerivativesAndFinancialInstrumentsUnitedDominionRealtyLpDetails FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS (UNITED DOMINION REALTY, L.P.) (Details) Uncategorized 99 false false R100.htm 22408401 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityUnitedDominionRealtyLpDetails DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) (Details) Uncategorized 100 false false R101.htm 22408402 - Disclosure - DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) - Effectiveness (Details) Sheet http://www.udr.com/20170331/role/DisclosureDerivativesAndHedgingActivityUnitedDominionRealtyLpEffectivenessDetails DERIVATIVES AND HEDGING ACTIVITY (UNITED DOMINION REALTY, L.P.) - Effectiveness (Details) Uncategorized 101 false false R102.htm 22409401 - Disclosure - CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) - Units Rollforward (Details) Sheet http://www.udr.com/20170331/role/DisclosureCapitalStructureUnitedDominionRealtyLpUnitsRollforwardDetails CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) - Units Rollforward (Details) Uncategorized 102 false false R103.htm 22409402 - Disclosure - CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) - Ownership Interests (Details) Sheet http://www.udr.com/20170331/role/DisclosureCapitalStructureUnitedDominionRealtyLpOwnershipInterestsDetails CAPITAL STRUCTURE (UNITED DOMINION REALTY, L.P.) - Ownership Interests (Details) Uncategorized 103 false false R104.htm 22411401 - Disclosure - REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) (Details) Sheet http://www.udr.com/20170331/role/DisclosureReportableSegmentsUnitedDominionRealtyLpDetails REPORTABLE SEGMENTS (UNITED DOMINION REALTY, L.P.) (Details) Uncategorized 104 false false All Reports Book All Reports c208-20180930.xml c208-20180930.xsd c208-20180930_cal.xml c208-20180930_def.xml c208-20180930_lab.xml c208-20180930_pre.xml http://fasb.org/us-gaap/2017-01-31 http://xbrl.sec.gov/dei/2014-01-31 http://xbrl.sec.gov/invest/2013-01-31 true true