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SALES OF PROPERTIES, DISCONTINUED OPERATIONS AND IMPAIRMENT (Details) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2015 | Feb. 03, 2014 property | Oct. 15, 2014 | Jan. 13, 2015
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Total sales price, net of closing costs |  |  |  |  |  | $ 43,788,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment |  | $ 36,062,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment |  |  |  |
Net book value of properties held for sale |  | 5,177,000 us-gaap_RealEstateHeldforsale |  |  |  | 10,176,000 us-gaap_RealEstateHeldforsale | 5,177,000 us-gaap_RealEstateHeldforsale |  |  |  |  |
Impairment charge |  |  |  |  |  | 1,093,000 us-gaap_AssetImpairmentCharges |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Rental income |  |  |  |  |  | 141,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome | 973,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome | 2,690,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRentalIncome |  |  |  |
Depreciation and amortization |  |  |  |  |  |  | 125,000 us-gaap_DepreciationAndAmortizationDiscontinuedOperations | 402,000 us-gaap_DepreciationAndAmortizationDiscontinuedOperations |  |  |  |
Real estate expenses |  |  |  |  |  | 17,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 12,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | 106,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense |  |  |  |
Interest expense |  |  |  |  |  | 111,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | 259,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | 615,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense |  |  |  |
Total expenses |  |  |  |  |  | 128,000 olp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses | 396,000 olp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses | 1,123,000 olp_DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses |  |  |  |
Income from operations |  |  |  |  |  | 13,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 577,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax | 1,567,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax |  |  |  |
Impairment charge |  |  |  |  |  |  | (62,000)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf |  |  |  |  |
Net gain on sales |  |  |  |  |  |  |  | 19,413,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |
Income from discontinued operations | 13,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 90,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 144,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 145,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 136,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 13,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 515,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 20,980,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Mortgage balance paid off |  |  |  |  |  |  |  |  | 7,376,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Write off of remaining balance of deferred mortgage costs |  |  |  |  |  |  |  |  | 249,000 us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Swap termination expense |  |  |  |  |  |  |  |  | 478,000 us-gaap_GainLossOnContractTermination / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Subsequent event | Non-Controlling Interests in Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  |  |  |  |  |  | 1,300,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Property in Florida and leased to Office Depot |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  | 2 olp_DiscontinuedOperationsNumberOfPropertiesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyInFloridaAndLeasedToOfficeDepotMember |  |  |  |
Property in New York |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold |  |  |  |  |  |  |  | 2 olp_DiscontinuedOperationsNumberOfPropertiesSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyInNewYorkMember |  |  |  |
Real estate property located in Michigan |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Number of properties under contract of sale |  |  |  |  |  |  |  |  |  | 2 olp_NumberOfPropertiesUnderContractOfSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember |  |
Total sales price, net of closing costs |  |  |  |  |  |  |  |  |  | 5,177,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember |  |
Net book value of properties held for sale |  | 5,177,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember |  |  |  |  | 5,177,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  | (61,700)us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMichiganMember |  |  |  |  |
Property located in Parsippany, New Jersey |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Total sales price, net of closing costs |  |  |  |  |  |  |  |  |  |  | 38,611,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInParsippanyNewJerseyMember |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  |  |  |  |  |  |  |  | 10,180,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInParsippanyNewJerseyMember |
Gain on sale of property for federal tax purposes |  |  |  |  |  |  |  |  |  |  | 20,700,000 olp_GainLossOnSaleOfPropertiesForFederalTaxPurposes / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInParsippanyNewJerseyMember |
Prepayment costs on debt related to sale of real estate |  |  |  |  |  |  |  |  |  |  | 1,581,000 olp_MortgagePrepaymentPenaltyIncurred / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInParsippanyNewJerseyMember |
Mortgage balance paid off |  |  |  |  |  |  |  |  |  |  | 13,417,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInParsippanyNewJerseyMember |
Property Located In Cherry Hill NJ Member | Consolidated JV | Real Estate in Cherry Hill, NJ |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Net book value of properties held for sale |  |  |  |  |  | 10,176,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember |  |  |  |  |  |
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Related assets of properties held for sale |  |  |  |  |  | 120,000 olp_AssetsRelatedToPropertyHeldForSale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember |  |  |  |  |  |
Property Located In Cherry Hill NJ Member | Consolidated JV | Real Estate in Cherry Hill, NJ | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Total sales price, net of closing costs |  |  |  |  |  |  |  |  |  |  |  | 16,025,000 us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of property |  |  |  |  |  |  |  |  | 5,400,000 us-gaap_GainLossOnSaleOfProperties / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_PropertyLocatedInCherryHillNjMember / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = olp_CherryHillNJMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Property located in Morrow, Georgia |  |  |  |  |  |  |  |  |  |  |  |
DISCONTINUED OPERATIONS AND REAL ESTATE INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |
Net book value of properties held for sale |  |  |  |  |  | 1,470,000 us-gaap_RealEstateHeldforsale / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMorrowGeorgiaMember |  |  |  |  |  |
Impairment charge |  |  |  |  |  | $ 1,093,000 us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = olp_RealEstatePropertyInMorrowGeorgiaMember |  |  |  |  |  |

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- Definition Carrying amounts as of balance sheet date of assets related to properties held for sale and includes unbilled rent receivable, other intangible assets and deferred mortgage costs (when applicable). + References No definition available. + Details
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- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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