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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Feb. 28, 2014 property | Dec. 31, 2014 item | Dec. 31, 2013 item | Jun. 30, 2014
Investment in Joint Ventures |  |  |  |
Number of joint ventures with controlling interest |  | 7 olp_NumberOfControllingInterestJointVentures |  |
Revenue from the ground lease |  | $ 531,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue |  |
Unbilled rent receivable |  | 12,815,000 us-gaap_DeferredRentReceivablesNet | 13,743,000 us-gaap_DeferredRentReceivablesNet |
Land |  | 165,153,000 us-gaap_Land | 153,529,000 us-gaap_Land |
Accrued expenses and other liabilities |  | 12,451,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent | 7,790,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent |
Non-controlling interests in joint ventures |  | 1,628,000 us-gaap_MinorityInterest | 1,158,000 us-gaap_MinorityInterest |
Number of unconsolidated joint ventures |  | 5 olp_NumberOfUnconsolidatedJointVentures | 5 olp_NumberOfUnconsolidatedJointVentures |
Reclassification |  |  |  |
Number of Properties as Transferred Assets and Liabilities which Sold to be Reclassified as Properties Held for Sale | 2 olp_NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale |  |  |
Noxell Corporation industrial building, Joppa, Maryland |  |  |  |
Investment in Joint Ventures |  |  |  |
Restricted assets |  | 0 us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Land |  | 3,805,000 us-gaap_Land / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Buildings and improvements, net of depreciation |  | 8,069,000 olp_InvestmentBuildingAndBuildingImprovementsNetOfDepreciation / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Cash |  | 527,000 us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Prepaid expenses and receivables |  | 42,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Accrued expenses and other liabilities |  | 152,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Non-controlling interests in joint ventures |  | 312,000 us-gaap_MinorityInterest / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Ownership interest in consolidated joint venture (as a percent) |  | 95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |
Land - River Crossing Apartments, Sandy Springs, Georgia |  |  |  |
Investment in Joint Ventures |  |  |  |
Contract Purchase Price |  |  |  | 6,510,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember
Number of apartment units in the complex purchased |  | 196 olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember |  |
Maximum exposure to loss |  | 6,712,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember |  |
Carrying value of the land |  | 6,516,000 us-gaap_LandAvailableForSale / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember |  |
Unbilled rent receivable |  | $ 196,000 us-gaap_DeferredRentReceivablesNet / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringsGeorgiaMember |  |
Consolidated JV |  |  |  |
Investment in Joint Ventures |  |  |  |
Number of joint ventures with controlling interest |  | 7 olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember |  |
Consolidated JV | Minimum |  |  |  |
Investment in Joint Ventures |  |  |  |
Ownership interest in consolidated joint venture (as a percent) |  | 85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Consolidated JV | Non Variable Interest Entity |  |  |  |
Investment in Joint Ventures |  |  |  |
Number of joint ventures with controlling interest |  | 6 olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember |  |
Consolidated JV | Non Variable Interest Entity | Minimum |  |  |  |
Investment in Joint Ventures |  |  |  |
Ownership interest in consolidated joint venture (as a percent) |  | 85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Consolidated JV | Non Variable Interest Entity | Maximum |  |  |  |
Investment in Joint Ventures |  |  |  |
Ownership interest in consolidated joint venture (as a percent) |  | 95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Consolidated JV | MCB Real Estate LLC And Its Affiliates |  |  |  |
Investment in Joint Ventures |  |  |  |
Number of joint ventures with controlling interest |  | 6 olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember |  |
Unconsolidated JV |  |  |  |
Investment in Joint Ventures |  |  |  |
Number of unconsolidated joint ventures |  | 5 olp_NumberOfUnconsolidatedJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_UnconsolidatedJointVentureMember |  |

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