Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net loss	$ (107,906)	$ (57,711)	$ (39,089)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Stock-based compensation	3,163us-gaap_ShareBasedCompensation	2,806us-gaap_ShareBasedCompensation	2,841us-gaap_ShareBasedCompensation
Depreciation, depletion and amortization	23,221	27,214	45,873
Amortization of investment in Ecuador property	33bpz_AmortizationOfInvestmentProperty	98bpz_AmortizationOfInvestmentProperty	188bpz_AmortizationOfInvestmentProperty
Deferred income taxes	29,543	(9,038)	(29,165)
Loss on disposition of assets	4,277us-gaap_GainLossOnDispositionOfAssets1	4,430us-gaap_GainLossOnDispositionOfAssets1
Asset impairments	58,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Loss on extinguishment of debt	1,245	7,222	7,318
(Gain) on divestiture			(26,864)
Amortization of discount and deferred financing fees	8,273	9,375	9,833
(Gain) loss on derivatives	(2)	(242)	2,610
Other non-cash items included in net loss	(33)us-gaap_OtherNoncashIncomeExpense	695us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	19,709	3,230	(16,349)
(Increase) decrease in value-added tax receivable	7,769	9,522	(21,259)
(Increase) decrease in inventory	5,006us-gaap_IncreaseDecreaseInInventories	2,326us-gaap_IncreaseDecreaseInInventories	(5,641)us-gaap_IncreaseDecreaseInInventories
(Increase) decrease in other assets	1,259	327	(3,379)
Decrease in income taxes receivable	59
Increase (decrease) in accounts payable	1,253	(18,852)	2,458
Increase (decrease) in accrued liabilities	(4,958)	(20,814)	12,036
Increase (decrease) in income taxes payable		(11,916)	11,691
Increase (decrease) in other liabilities	(18,716)	(1,299)	836
Net cash provided by (used in) operating activities	31,195	(52,627)	(46,062)
Cash flows from investing activities:
Property and equipment additions	(29,433)	(13,472)	(82,203)
Divestiture of properties and equipment			79,299
(Increase) decrease in restricted cash	3,150	67,440	(62,934)
Proceeds from maturity of investment securities		1,000
Purchase of investment securities		(1,000)
Net cash provided by (used in) investing activities	(26,283)	53,968	(65,838)
Cash flows from financing activities:
Borrowings		78,355	195,688
Repayments of borrowings		(99,107)us-gaap_RepaymentsOfDebt	(54,919)us-gaap_RepaymentsOfDebt
Deferred and other loan fees	(324)us-gaap_PaymentsOfFinancingCosts	(6,782)us-gaap_PaymentsOfFinancingCosts	(3,597)us-gaap_PaymentsOfFinancingCosts
Proceeds from exercise of stock options, net	129	0	0
Proceeds from sale of common stock, net	37	48	96
Net cash provided by (used in) financing activities	(158)	(27,486)	137,268
Net increase (decrease) in cash and cash equivalents	4,754	(26,145)	25,368
Cash and cash equivalents at beginning of period	57,395	83,540	58,172
Cash and cash equivalents at end of period	62,149	57,395	83,540
Cash paid for:
Interest	18,412us-gaap_InterestPaidNet	17,362us-gaap_InterestPaidNet	22,716us-gaap_InterestPaidNet
Income tax	1,552us-gaap_IncomeTaxesPaid	14,476us-gaap_IncomeTaxesPaid	1,793us-gaap_IncomeTaxesPaid
Non — cash items:
Convertible debt exchanged	26,000	72,850
Debt transferred to current and other non-current liabilities related to 2012 Block Z-1 exploratory expenditures			40,697
Depletion allocated to production inventory	517	320	648
Depreciation on support equipment capitalized to construction in progress			472
Asset retirement obligation capitalized to property and equipment, net of revisions	3,634	1,381	1,314
Property and equipment transferred to / from current assets / liabilities or other non-current assets		952
Gain on capital lease repayment capitalized to property and equipment			180
Block Z-1 [Member] \| Debt Paid From Sales Proceeds [Member]
Cash flows from investing activities:
Divestiture of properties and equipment			150,000
Block Z-1 [Member]
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
(Gain) on divestiture			(26,900)
Cash flows from investing activities:
Divestiture of properties and equipment			85,000
Debt Exchanged For Value Added Tax Receivable [Member]
Non — cash items:
Debt exchanged			24,196
Debt Paid From Sales Proceeds [Member]
Non — cash items:
Debt exchanged			65,000
Debt Exchanged for Property Additions [Member]
Non — cash items:
Debt exchanged			$ 65,795

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- Definition

The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

+ References

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- Definition

The cash outflow for loan and debt issuance costs.

+ References

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- Definition

Amount of cash outflow through purchase of long-term held-to-maturity securities.

+ 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Paragraph 13

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ 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 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

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

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- 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.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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