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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 | $ 304,808,000 us-gaap_SecuredDebt |  | $ 304,808,000 us-gaap_SecuredDebt |  |  | $ 292,049,000 us-gaap_SecuredDebt
Revenue from the ground lease | 252,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue |  |  |  |  |
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure |  |  |  |  |  |
Carrying Amount | 16,337,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets |  | 16,337,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets |  |  |
Unbilled rent receivable | 12,870,000 us-gaap_DeferredRentReceivablesNet |  | 12,870,000 us-gaap_DeferredRentReceivablesNet |  |  | 12,815,000 us-gaap_DeferredRentReceivablesNet
Maximum Exposure to Loss | 16,337,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount |  | 16,337,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount |  |  |
Restricted cash | 1,335,000 us-gaap_RestrictedCashAndCashEquivalents |  | 1,335,000 us-gaap_RestrictedCashAndCashEquivalents |  |  | 1,607,000 us-gaap_RestrictedCashAndCashEquivalents
Land | 20,132,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand |  | 20,132,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand |  |  |
Accrued expenses and other liabilities | 12,026,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent |  | 12,026,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent |  |  | 12,451,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Non-controlling interests in joint ventures | 2,085,000 us-gaap_MinorityInterest |  | 2,085,000 us-gaap_MinorityInterest |  |  | 1,628,000 us-gaap_MinorityInterest
Investment in unconsolidated joint ventures | 2,486,000 us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures |  | 2,486,000 us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures |  |  | 4,907,000 us-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 | 0 us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 0 us-gaap_OtherRestrictedAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |
Land | 3,815,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 3,815,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |
Buildings and improvements, net of depreciation | 8,016,000 olp_InvestmentBuildingAndBuildingImprovementsNetOfDepreciation / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |  |  |
Cash | 451,000 us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 451,000 us-gaap_Cash / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |
Prepaid expenses and receivables | 43,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 43,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |
Accrued expenses and other liabilities | 181,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 181,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  |  |
Non-controlling interests in joint ventures | 323,000 us-gaap_MinorityInterest / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = olp_NoxellCorporationIndustrialBuildingJoppaMarylandMember |  | 323,000 us-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 | 6 olp_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 | 5 olp_NumberOfControllingInterestJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember |  |  |  |  |
Investment in consolidated joint ventures | 19,000,000 olp_RealEstateInvestmentsConsolidatedRealEstateAndOtherJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember |  | 19,000,000 olp_RealEstateInvestmentsConsolidatedRealEstateAndOtherJointVentures / us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis = olp_ConsolidatedJointVentureMember / dei_LegalEntityAxis = olp_MCBRealEstateLLCAndItsAffiliatesMember |  |  |
Land - The Meadows Apartments, Lakemoor, Illinois |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |
Contract Purchase Price | 9,300,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  | 9,300,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |  |
Number of apartment units in the complex purchased |  |  | 496 olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |  |
Mortgage debt | 43,824,000 us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  | 43,824,000 us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember |  |  |
Variable Interest Entity, Nonconsolidated, Comparison of Carrying Amount of Assets and Liabilities to Maximum Loss Exposure |  |  |  |  |  |
Land | 9,528,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember | [1] | 9,528,000 us-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 | 9,528,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  | 9,528,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  |  |
Maximum Exposure to Loss | 9,528,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_PropertyLocatedInLandMeadowsApartmentsLakemoorIllinoisMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  | 9,528,000 us-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 |  |  |  |  | 6,510,000 us-gaap_PaymentsToAcquireRealEstate / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember |
Number of apartment units in the complex purchased |  |  |  |  | 196 olp_NumberOfApartmentComplexUnitsPurchased / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember |
Mortgage debt | 16,230,000 us-gaap_SecuredDebt / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember |  | 16,230,000 us-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 | 1,335,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember |  | 1,335,000 us-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 | 6,528,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  | 6,528,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  |  |
Maximum Exposure to Loss | 6,528,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = us-gaap_PropertyPlantAndEquipmentMember |  | 6,528,000 us-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 | 281,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember |  | 281,000 us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountAssets / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember |  |  |
Maximum Exposure to Loss | $ 281,000 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_BusinessAcquisitionAxis = olp_LandRiverCrossingApartmentsSandySpringGeorgiaMember / us-gaap_FairValueByAssetClassAxis = olp_UnbilledRentReceivableMember |  | $ 281,000 us-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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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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