3.7.0.1 html 401 470 1 false 221 0 false 8 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.onelibertyproperties.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedBalanceSheets CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedBalanceSheetsParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedStatementsOfIncome CONSOLIDATED STATEMENTS OF INCOME Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 00400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedStatementsOfChangesInEquity CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Statements 6 false false R7.htm 00405 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedStatementsOfChangesInEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) Statements 7 false false R8.htm 00500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.onelibertyproperties.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 10101 - Disclosure - ORGANIZATION AND BACKGROUND Sheet http://www.onelibertyproperties.com/role/DisclosureOrganizationAndBackground ORGANIZATION AND BACKGROUND Notes 9 false false R10.htm 10201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.onelibertyproperties.com/role/DisclosureSignificantAccountingPolicies SIGNIFICANT ACCOUNTING POLICIES Notes 10 false false R11.htm 10301 - Disclosure - EARNINGS PER COMMON SHARE Sheet http://www.onelibertyproperties.com/role/DisclosureEarningsPerCommonShare EARNINGS PER COMMON SHARE Notes 11 false false R12.htm 10401 - Disclosure - REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS Sheet http://www.onelibertyproperties.com/role/DisclosureRealEstateInvestmentsAndMinimumFutureRentals REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS Notes 12 false false R13.htm 10501 - Disclosure - SALE AND DISPOSAL OF PROPERTIES, IMPAIRMENT AND DISCONTINUED OPERATIONS Sheet http://www.onelibertyproperties.com/role/DisclosureSaleAndDisposalOfPropertiesImpairmentAndDiscontinuedOperations SALE AND DISPOSAL OF PROPERTIES, IMPAIRMENT AND DISCONTINUED OPERATIONS Notes 13 false false R14.htm 10601 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVentures VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES Notes 14 false false R15.htm 10701 - Disclosure - INVESTMENT IN UNCONSOLIDATED JOINT VENTURES Sheet http://www.onelibertyproperties.com/role/DisclosureInvestmentInUnconsolidatedJointVentures INVESTMENT IN UNCONSOLIDATED JOINT VENTURES Notes 15 false false R16.htm 10801 - Disclosure - OTHER INCOME ITEMS Sheet http://www.onelibertyproperties.com/role/DisclosureOtherIncomeItems OTHER INCOME ITEMS Notes 16 false false R17.htm 10901 - Disclosure - DEBT OBLIGATIONS Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligations DEBT OBLIGATIONS Notes 17 false false R18.htm 11001 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurements FAIR VALUE MEASUREMENTS Notes 18 false false R19.htm 11101 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.onelibertyproperties.com/role/DisclosureRelatedPartyTransactions RELATED PARTY TRANSACTIONS Notes 19 false false R20.htm 11201 - Disclosure - STOCKHOLDERS' EQUITY Sheet http://www.onelibertyproperties.com/role/DisclosureStockholdersEquity STOCKHOLDERS' EQUITY Notes 20 false false R21.htm 11301 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.onelibertyproperties.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 21 false false R22.htm 11401 - Disclosure - INCOME TAXES Sheet http://www.onelibertyproperties.com/role/DisclosureIncomeTaxes INCOME TAXES Notes 22 false false R23.htm 11501 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.onelibertyproperties.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 23 false false R24.htm 11601 - Disclosure - QUARTERLY FINANCIAL DATA (Unaudited) Sheet http://www.onelibertyproperties.com/role/DisclosureQuarterlyFinancialDataUnaudited QUARTERLY FINANCIAL DATA (Unaudited) Notes 24 false false R25.htm 11701 - Disclosure - Schedule III - Consolidated Real Estate and Accumulated Depreciation Sheet http://www.onelibertyproperties.com/role/DisclosureScheduleIiiConsolidatedRealEstateAndAccumulatedDepreciation Schedule III - Consolidated Real Estate and Accumulated Depreciation Notes 25 false false R26.htm 20202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.onelibertyproperties.com/role/DisclosureSignificantAccountingPoliciesPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 26 false false R27.htm 30303 - Disclosure - EARNINGS PER COMMON SHARE (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureEarningsPerCommonShareTables EARNINGS PER COMMON SHARE (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureEarningsPerCommonShare 27 false false R28.htm 30403 - Disclosure - REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureRealEstateInvestmentsAndMinimumFutureRentalsTables REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureRealEstateInvestmentsAndMinimumFutureRentals 28 false false R29.htm 30503 - Disclosure - SALE AND DISPOSAL OF PROPERTIES, DISCONTINUED OPERATIONS AND IMPAIRMENT (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureSaleAndDisposalOfPropertiesDiscontinuedOperationsAndImpairmentTables SALE AND DISPOSAL OF PROPERTIES, DISCONTINUED OPERATIONS AND IMPAIRMENT (Tables) Tables 29 false false R30.htm 30603 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesTables VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVentures 30 false false R31.htm 30903 - Disclosure - DEBT OBLIGATIONS (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligationsTables DEBT OBLIGATIONS (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureDebtObligations 31 false false R32.htm 31003 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurementsTables FAIR VALUE MEASUREMENTS (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurements 32 false false R33.htm 31203 - Disclosure - STOCKHOLDERS' EQUITY (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureStockholdersEquityTables STOCKHOLDERS' EQUITY (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureStockholdersEquity 33 false false R34.htm 31403 - Disclosure - INCOME TAXES (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureIncomeTaxes 34 false false R35.htm 31603 - Disclosure - QUARTERLY FINANCIAL DATA (Unaudited): (Tables) Sheet http://www.onelibertyproperties.com/role/DisclosureQuarterlyFinancialDataUnauditedTables QUARTERLY FINANCIAL DATA (Unaudited): (Tables) Tables http://www.onelibertyproperties.com/role/DisclosureQuarterlyFinancialDataUnaudited 35 false false R36.htm 40101 - Disclosure - ORGANIZATION AND BACKGROUND (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureOrganizationAndBackgroundDetails ORGANIZATION AND BACKGROUND (Details) Details http://www.onelibertyproperties.com/role/DisclosureOrganizationAndBackground 36 false false R37.htm 40201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureSignificantAccountingPoliciesPrinciplesOfConsolidationDetails SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Details) Details 37 false false R38.htm 40202 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureSignificantAccountingPoliciesDepreciationAndAmortizationDetails SIGNIFICANT ACCOUNTING POLICIES - Depreciation and Amortization (Details) Details 38 false false R39.htm 40203 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureSignificantAccountingPoliciesConcentrationOfCreditRiskDetails SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) Details 39 false false R40.htm 40301 - Disclosure - EARNINGS PER COMMON SHARE (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureEarningsPerCommonShareDetails EARNINGS PER COMMON SHARE (Details) Details http://www.onelibertyproperties.com/role/DisclosureEarningsPerCommonShareTables 40 false false R41.htm 40401 - Disclosure - REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Real Estate Acquisitions (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureRealEstateInvestmentsAndMinimumFutureRentalsRealEstateAcquisitionsDetails REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Real Estate Acquisitions (Details) Details 41 false false R42.htm 40402 - Disclosure - REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Pro Forma Information (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureRealEstateInvestmentsAndMinimumFutureRentalsProFormaInformationDetails REAL ESTATE INVESTMENTS AND MINIMUM FUTURE RENTALS - Pro Forma Information (Details) Details 42 false false R43.htm 40501 - Disclosure - SALE AND DISPOSAL OF PROPERTIES, IMPAIRMENT AND DISCONTINUED OPERATIONS (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureSaleAndDisposalOfPropertiesImpairmentAndDiscontinuedOperationsDetails SALE AND DISPOSAL OF PROPERTIES, IMPAIRMENT AND DISCONTINUED OPERATIONS (Details) Details http://www.onelibertyproperties.com/role/DisclosureSaleAndDisposalOfPropertiesImpairmentAndDiscontinuedOperations 43 false false R44.htm 40601 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesGroundLeasesDetails VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) Details http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesTables 44 false false R45.htm 40602 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Consolidated Joint Ventures (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesConsolidatedJointVenturesDetails VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Consolidated Joint Ventures (Details) Details 45 false false R46.htm 40603 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Summary of Consolidated VIE's (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesSummaryOfConsolidatedVieSDetails VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Summary of Consolidated VIE's (Details) Details 46 false false R47.htm 40604 - Disclosure - VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - MCB Real Estate, LLC (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureVariableInterestEntitiesContingentLiabilitiesAndConsolidatedJointVenturesMcbRealEstateLlcDetails VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - MCB Real Estate, LLC (Details) Details 47 false false R48.htm 40701 - Disclosure - INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureInvestmentInUnconsolidatedJointVenturesDetails INVESTMENT IN UNCONSOLIDATED JOINT VENTURES (Details) Details http://www.onelibertyproperties.com/role/DisclosureInvestmentInUnconsolidatedJointVentures 48 false false R49.htm 40801 - Disclosure - OTHER INCOME ITEMS - Other Income (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureOtherIncomeItemsOtherIncomeDetails OTHER INCOME ITEMS - Other Income (Details) Details 49 false false R50.htm 40802 - Disclosure - OTHER INCOME ITEMS - Lease Termination Fees (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureOtherIncomeItemsLeaseTerminationFeesDetails OTHER INCOME ITEMS - Lease Termination Fees (Details) Details 50 false false R51.htm 40901 - Disclosure - DEBT OBLIGATIONS - ASU adjustments (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligationsAsuAdjustmentsDetails DEBT OBLIGATIONS - ASU adjustments (Details) Details 51 false false R52.htm 40902 - Disclosure - DEBT OBLIGATIONS - Mortgage Payable current (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligationsMortgagePayableCurrentDetails DEBT OBLIGATIONS - Mortgage Payable current (Details) Details 52 false false R53.htm 40903 - Disclosure - DEBT OBLIGATIONS - Principal payments (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligationsPrincipalPaymentsDetails DEBT OBLIGATIONS - Principal payments (Details) Details 53 false false R54.htm 40904 - Disclosure - DEBT OBLIGATIONS - Line of Credit (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureDebtObligationsLineOfCreditDetails DEBT OBLIGATIONS - Line of Credit (Details) Details 54 false false R55.htm 41001 - Disclosure - FAIR VALUE MEASUREMENTS - Available for Sale (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurementsAvailableForSaleDetails FAIR VALUE MEASUREMENTS - Available for Sale (Details) Details 55 false false R56.htm 41002 - Disclosure - FAIR VALUE MEASUREMENTS - Interest Rate Derivatives (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurementsInterestRateDerivativesDetails FAIR VALUE MEASUREMENTS - Interest Rate Derivatives (Details) Details 56 false false R57.htm 41003 - Disclosure - FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureFairValueMeasurementsDerivativeInstrumentsGainLossDetails FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details) Details 57 false false R58.htm 41101 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureRelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS (Details) Details http://www.onelibertyproperties.com/role/DisclosureRelatedPartyTransactions 58 false false R59.htm 41201 - Disclosure - STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureStockholdersEquityStockBasedCompensationDetails STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) Details 59 false false R60.htm 41202 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock Dividend Distributions (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureStockholdersEquityCommonStockDividendDistributionsDetails STOCKHOLDERS' EQUITY - Common Stock Dividend Distributions (Details) Details 60 false false R61.htm 41301 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.onelibertyproperties.com/role/DisclosureCommitmentsAndContingencies 61 false false R62.htm 41401 - Disclosure - INCOME TAXES (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureIncomeTaxesDetails INCOME TAXES (Details) Details http://www.onelibertyproperties.com/role/DisclosureIncomeTaxesTables 62 false false R63.htm 41501 - Disclosure - SUBSEQUENT EVENTS (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureSubsequentEventsDetails SUBSEQUENT EVENTS (Details) Details http://www.onelibertyproperties.com/role/DisclosureSubsequentEvents 63 false false R64.htm 41601 - Disclosure - QUARTERLY FINANCIAL DATA (Unaudited): (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureQuarterlyFinancialDataUnauditedDetails QUARTERLY FINANCIAL DATA (Unaudited): (Details) Details http://www.onelibertyproperties.com/role/DisclosureQuarterlyFinancialDataUnauditedTables 64 false false R65.htm 41701 - Disclosure - Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details) Sheet http://www.onelibertyproperties.com/role/DisclosureScheduleIiiConsolidatedRealEstateAndAccumulatedDepreciationDetails Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details) Details http://www.onelibertyproperties.com/role/DisclosureScheduleIiiConsolidatedRealEstateAndAccumulatedDepreciation 65 false false R66.htm 41702 - Disclosure - Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) Sheet http://www.onelibertyproperties.com/role/DisclosureScheduleIiiConsolidatedRealEstateAndAccumulatedDepreciationDetails2 Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) Details http://www.onelibertyproperties.com/role/DisclosureScheduleIiiConsolidatedRealEstateAndAccumulatedDepreciation 66 false false All Reports Book All Reports olp-20161231.xml olp-20161231.xsd olp-20161231_cal.xml olp-20161231_def.xml olp-20161231_lab.xml olp-20161231_pre.xml true true