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Note 8 - Property, Equipment and Construction in Progress (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
Apr. 27, 2012
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 14, 2012
Dec. 14, 2012
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Capitalized Exploratory Well Costs   $ 6,600,000us-gaap_CapitalizedExploratoryWellCosts   $ 6,600,000us-gaap_CapitalizedExploratoryWellCosts $ 6,600,000us-gaap_CapitalizedExploratoryWellCosts      
Payments to Acquire Property, Plant, and Equipment       29,433,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 13,472,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment 82,203,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment    
Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves       2,400,000us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves 13,500,000us-gaap_ReclassificationToWellFacilitiesAndEquipmentBasedOnDeterminationOfProvedReserves      
Interest Costs Capitalized       9,250,000us-gaap_InterestCostsCapitalized 9,858,000us-gaap_InterestCostsCapitalized 15,600,000us-gaap_InterestCostsCapitalized    
Ownership Percentage Sold, Oil and Gas Exploration Block 49.00%bpz_OwnershipPercentageSoldOilAndGasExplorationBlock              
Capital and Exploratory Expenditures Funding Agreement 185,000,000bpz_CapitalAndExploratoryExpendituresFundingAgreement     177,900,000bpz_CapitalAndExploratoryExpendituresFundingAgreement 81,300,000bpz_CapitalAndExploratoryExpendituresFundingAgreement      
Asset Impairment Charges   17,000,000us-gaap_AssetImpairmentCharges 41,000,000us-gaap_AssetImpairmentCharges 58,000,000us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges    
Block Z-1 [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Ownership Percentage Sold, Oil and Gas Exploration Block 49.00%bpz_OwnershipPercentageSoldOilAndGasExplorationBlock
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
          49.00%bpz_OwnershipPercentageSoldOilAndGasExplorationBlock
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
49.00%bpz_OwnershipPercentageSoldOilAndGasExplorationBlock
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
Capital and Exploratory Expenditures Funding Agreement 185,000,000bpz_CapitalAndExploratoryExpendituresFundingAgreement
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
      80,600,000bpz_CapitalAndExploratoryExpendituresFundingAgreement
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
     
CX-15 Development Drilling Programs [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       63,500,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_CX15DevelopmentDrillingProgramsMember
       
Development Drilling Program - Albacora [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       61,000,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_DevelopmentDrillingProgramAlbacoraMember
       
The Delfin Platform [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       18,400,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_TheDelfinPlatformMember
       
Piedra Redonda Platform [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       14,800,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_PiedraRedondaPlatformMember
       
CX-15 Platform [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       2,800,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_CX15PlatformMember
       
Other Capitalized Property Plant and Equipment [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       6,600,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
2,300,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
     
Interest Costs Capitalized       500,000us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
1,900,000us-gaap_InterestCostsCapitalized
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
     
Development of Gas Fired Power Generation Facility in Peru [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       33,100,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_DevelopmentOfGasFiredPowerGenerationFacilityInPeruMember
13,500,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_DevelopmentOfGasFiredPowerGenerationFacilityInPeruMember
     
Block XXIII [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       18,800,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_BlockXXIIIMember
2,400,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_BlockXXIIIMember
     
Interest Costs Capitalized       1,600,000us-gaap_InterestCostsCapitalized
/ bpz_DevelopmentCostsAxis
= bpz_BlockXXIIIMember
       
Power Plant [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       7,700,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_PowerPlantMember
8,800,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_PowerPlantMember
     
Interest Costs Capitalized       7,100,000us-gaap_InterestCostsCapitalized
/ bpz_DevelopmentCostsAxis
= bpz_PowerPlantMember
8,000,000us-gaap_InterestCostsCapitalized
/ bpz_DevelopmentCostsAxis
= bpz_PowerPlantMember
     
Block Z-1 [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment       1,800,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_BlockZ1Member
       
CX-15 Platform at the Corvina Field [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment         14,100,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ bpz_DevelopmentCostsAxis
= bpz_CX15PlatformAtTheCorvinaFieldMember
     
Using Straight-Line Five Year Life [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Other Depreciation and Amortization         1,400,000us-gaap_OtherDepreciationAndAmortization
/ us-gaap_FairValueByMeasurementFrequencyAxis
= bpz_UsingStraightLineFiveYearLifeMember
     
CX-15 Development Drilling Programs [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment         38,600,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_NatureOfExpenseAxis
= bpz_CX15DevelopmentDrillingProgramsMember
     
Development Drilling Program - Albacora [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment         17,900,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_NatureOfExpenseAxis
= bpz_DevelopmentDrillingProgramAlbacoraMember
     
CX-15 Platform at the Corvina Field [Member]                
Note 8 - Property, Equipment and Construction in Progress (Details) [Line Items]                
Payments to Acquire Property, Plant, and Equipment         $ 4,200,000us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
/ us-gaap_NatureOfExpenseAxis
= bpz_CX15PlatformAtTheCorvinaFieldMember