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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015		Mar. 31, 2015 item		Jun. 30, 2014 item	Dec. 31, 2014
Variable Interest Entities
Mortgage debt	$ 304,808,000us-gaap_SecuredDebt		$ 304,808,000us-gaap_SecuredDebt			$ 292,049,000us-gaap_SecuredDebt
Revenue from the ground lease	252,000us-gaap_OperatingLeasesIncomeStatementLeaseRevenue
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Carrying Amount	16,337,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets		16,337,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets
Unbilled rent receivable	12,870,000us-gaap_DeferredRentReceivablesNet		12,870,000us-gaap_DeferredRentReceivablesNet			12,815,000us-gaap_DeferredRentReceivablesNet
Maximum Exposure to Loss	16,337,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount		16,337,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Restricted cash	1,335,000us-gaap_RestrictedCashAndCashEquivalents		1,335,000us-gaap_RestrictedCashAndCashEquivalents			1,607,000us-gaap_RestrictedCashAndCashEquivalents
Land	20,132,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand		20,132,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand
Accrued expenses and other liabilities	12,026,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent		12,026,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent			12,451,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Non-controlling interests in joint ventures	2,085,000us-gaap_MinorityInterest		2,085,000us-gaap_MinorityInterest			1,628,000us-gaap_MinorityInterest
Investment in unconsolidated joint ventures	2,486,000us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures		2,486,000us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures			4,907,000us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
Noxell Corporation industrial building, Joppa, Maryland
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Ownership interest in consolidated joint venture of the company (as a percent)					95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Restricted assets	0us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		0us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Land	3,815,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		3,815,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Buildings and improvements, net of depreciation	8,016,000olp_InvestmentBuildingAndBuildingImprovementsNetOfDepreciation / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Cash	451,000us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		451,000us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Prepaid expenses and receivables	43,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		43,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Accrued expenses and other liabilities	181,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		181,000us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Non-controlling interests in joint ventures	323,000us-gaap_MinorityInterest / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember		323,000us-gaap_MinorityInterest / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember
Non Variable Interest Entity | Consolidated JV
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Number of joint ventures with controlling interest	6olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember
Non Variable Interest Entity | Minimum | Consolidated JV
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Ownership interest in consolidated joint venture of the company (as a percent)	85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MinimumMember		85.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Non Variable Interest Entity | Maximum | Consolidated JV
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Ownership interest in consolidated joint venture of the company (as a percent)	95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MaximumMember		95.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_NonVariableInterestEntityMember / us-gaap_RangeAxis = us-gaap_MaximumMember
MCB Real Estate LLC And Its Affiliates | Consolidated JV
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Number of joint ventures with controlling interest	5olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember
Investment in consolidated joint ventures	19,000,000olp_RealEstateInvestmentsConsolidatedRealEstateAndOtherJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember		19,000,000olp_RealEstateInvestmentsConsolidatedRealEstateAndOtherJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember
Land - The Meadows Apartments, Lakemoor, Illinois
Variable Interest Entities
Contract Purchase Price	9,300,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember		9,300,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember
Number of apartment units in the complex purchased			496olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember
Mortgage debt	43,824,000us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember		43,824,000us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Land	9,528,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember	[1]	9,528,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember	[1]
Land - The Meadows Apartments, Lakemoor, Illinois | Land
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Carrying Amount	9,528,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember		9,528,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Maximum Exposure to Loss	9,528,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember		9,528,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Land - River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Contract Purchase Price					6,510,000us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember
Number of apartment units in the complex purchased					196olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember
Mortgage debt	16,230,000us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember		16,230,000us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Restricted cash	1,335,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember		1,335,000us-gaap_RestrictedCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember
Land - River Crossing Apartments, Sandy Springs, Georgia | Land
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Carrying Amount	6,528,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember		6,528,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Maximum Exposure to Loss	6,528,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember		6,528,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember
Land - River Crossing Apartments, Sandy Springs, Georgia | Unbilled rent receivable
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure
Carrying Amount	281,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember		281,000us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember
Maximum Exposure to Loss	$ 281,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember		$ 281,000us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember
[1] Includes capitalized transaction costs of $228 incurred with this asset acquisition.

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