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Consolidated Statements of Cash Flows (Parentheticals) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Apr. 27, 2012
Dec. 31, 2012
Sales proceeds   $ 150,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment $ 79,299us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Block Z-1 [Member] | Debt Paid From Sales Proceeds [Member]      
Sales proceeds     150,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member
/ us-gaap_DebtInstrumentAxis
= bpz_DebtPaidFromSalesProceedsMember
Block Z-1 [Member]      
Sales proceeds $ 85,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member		 $ 150,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member		 $ 85,000us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
/ us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis
= bpz_BlockZ1Member