Name:	bpz_Note18CommitmentsandContingenciesDetailsLineItems
Namespace Prefix:	bpz_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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 power capacity of a power plant.

+ References

No definition available.

+ Details

Name:	bpz_PlantCapacity
Namespace Prefix:	bpz_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the profit sharing percentage paid by the Company.

+ References

No definition available.

+ Details

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

- Definition

Value-added tax in Peru imposed on goods and services.

+ References

No definition available.

+ Details

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

- Definition

The aggregate costs related to construction and development services during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

+ Details

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

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Note 18 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	2 Months Ended	6 Months Ended	40 Months Ended
	Feb. 28, 2011	Jun. 30, 2014	Jun. 30, 2014
Note 18 - Commitments and Contingencies (Details) [Line Items]
Value-added Tax Rate	19.00%	18.00%	18.00%
Ownership Percentage, Oil and Gas Exploration Block		10.00%	10.00%
Mining Companies [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Profit Sharing Percentage		8.00%	8.00%
Oil and Gas Companies [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Profit Sharing Percentage		5.00%	5.00%
Santa Elena Property [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Other Commitment		$ 3.8	$ 3.8
Ownership Percentage, Oil and Gas Exploration Block		10.00%	10.00%
Estimated Cost of Gas-to-power Project [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Construction and Development Costs		153.5
Estimated Cost of Power Plant [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Construction and Development Costs		133.5
Estimated Cost of Pipeline Construction [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Construction and Development Costs		$ 20.0
Power Plant [Member] \| Power Transmission Lines [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Plant Capacity		420
Power Plant [Member]
Note 18 - Commitments and Contingencies (Details) [Line Items]
Plant Capacity		135