Amount agreed to under the Stock Purchase Agreement to continue capital and exploratory expenditures

No definition available.

Name:	bpz_CapitalAndExploratoryExpendituresFundingAgreement
Namespace Prefix:	bpz_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the area of land for developed and undeveloped gas and oil properties.

+ References

No definition available.

+ Details

Name:	bpz_GasAndOilAreaDevelopedAndUndevelopedGross
Namespace Prefix:	bpz_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

This item represents the area of land for developed and undeveloped gas and oil properties, net.

+ References

No definition available.

+ Details

Name:	bpz_GasAndOilAreaDevelopedAndUndevelopedNet
Namespace Prefix:	bpz_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	bpz_Note1BasisofPresentationDetailsLineItems
Namespace Prefix:	bpz_
Data Type:	xbrli:stringItemType
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- Definition

The amount of ownership percentage in an oil and gas exploration block.

+ References

No definition available.

+ Details

Name:	bpz_OwnershipPercentageOilAndGasExplorationBlock
Namespace Prefix:	bpz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of ownership percentage sold in an oil and gas exploration block.

+ References

No definition available.

+ Details

Name:	bpz_OwnershipPercentageSoldOilAndGasExplorationBlock
Namespace Prefix:	bpz_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The term of an oil and gas exploration phase.

+ References

No definition available.

+ Details

Name:	bpz_TermOfExplorationPhase
Namespace Prefix:	bpz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The length of time that the term for exploration phases may be extended by.

+ References

No definition available.

+ Details

Name:	bpz_TermOfExplorationPhaseExtension
Namespace Prefix:	bpz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The term of an oil and gas exploration phase if the exploration activities are deemed successful.

+ References

No definition available.

+ Details

Name:	bpz_TermOfExplorationPhaseSuccessful
Namespace Prefix:	bpz_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Area spaced or assigned to productive wells in which a working interest is owned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 4

-Subparagraph A

+ Details

Name:	us-gaap_GasAndOilAreaDevelopedGross
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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- Details

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Data Type:	na
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- Details

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=bpz_GasProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_OilAndGasDeliveryCommitmentsAndContractsAxis=bpz_OilProductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Note 1 - Basis of Presentation (Details) (USD $)	1 Months Ended	12 Months Ended			0 Months Ended		1 Months Ended
Note 1 - Basis of Presentation (Details) (USD $)	Apr. 27, 2012	Dec. 31, 2014 acre	Dec. 31, 2013	Dec. 31, 2012	Dec. 14, 2012	Dec. 14, 2012	Dec. 31, 2012
Note 1 - Basis of Presentation (Details) [Line Items]
Gas and Oil Area Developed and Undeveloped, Gross		2,200,000
Gas and Oil Area Developed and Undeveloped, Net		1,900,000
Ownership Percentage, Oil and Gas Exploration Block		100.00%
Term of Exploration Phase		7 years
Proceeds from Sale of Oil and Gas Property and Equipment	$ 150,000,000			$ 79,299,000
Ownership Percentage Sold, Oil and Gas Exploration Block	49.00%
Capital and Exploratory Expenditures Funding Agreement	185,000,000	177,900,000	81,300,000
Block Z-1 [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Ownership Percentage, Oil and Gas Exploration Block		51.00%
Gas and Oil Area, Developed, Gross		600,000
Proceeds from Sale of Oil and Gas Property and Equipment	150,000,000			85,000,000			85,000,000
Ownership Percentage Sold, Oil and Gas Exploration Block	49.00%				49.00%	49.00%
Capital and Exploratory Expenditures Funding Agreement	$ 185,000,000		$ 80,600,000
Block XIX [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Ownership Percentage, Oil and Gas Exploration Block		100.00%
Gas and Oil Area, Developed, Gross		500,000
Block XXII [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Ownership Percentage, Oil and Gas Exploration Block		100.00%
Gas and Oil Area, Developed, Gross		900,000
Block XXIII [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Ownership Percentage, Oil and Gas Exploration Block		100.00%
Gas and Oil Area, Developed, Gross		200,000
SMC Ecuador Inc. [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Ownership Percentage, Oil and Gas Exploration Block		10.00%
Minimum [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Term of Exploration Phase, Extension		3 years
Maximum [Member] \| Oil Production [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Term of Exploration Phase, Successful		40 years
Maximum [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Term of Exploration Phase, Extension		10 years
Oil Production [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Term of Exploration Phase, Successful		30 years
Gas Production [Member]
Note 1 - Basis of Presentation (Details) [Line Items]
Term of Exploration Phase, Successful		40 years