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Supplemental Information on Oil and Gas Producing Activities - Results of Operations for Oil and Gas Producing Activities (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and gas sales | $ 23,037 us-gaap_OilAndGasSalesRevenue | [1] | $ 24,486 us-gaap_OilAndGasSalesRevenue | [1] | $ 52,098 us-gaap_OilAndGasSalesRevenue | [1] | $ 28,071 us-gaap_OilAndGasSalesRevenue | [1] | $ 58,282 us-gaap_OilAndGasSalesRevenue | [1] | $ 37,740 us-gaap_OilAndGasSalesRevenue | [1] | $ 29,118 us-gaap_OilAndGasSalesRevenue | [1] | $ 44,137 us-gaap_OilAndGasSalesRevenue | [1] | $ 127,691 us-gaap_OilAndGasSalesRevenue | $ 169,277 us-gaap_OilAndGasSalesRevenue | $ 195,287 us-gaap_OilAndGasSalesRevenue
United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and gas sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,369 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US | 1,891 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US | 2,798 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_US
Production, G&A and other expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (467)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_US | (12,232)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_US | (47,866)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_US
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (901)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_US | (1,528)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_US | (3,872)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_US
Results from oil and gas producing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US | (11,869)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US | (48,940)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_US
Gabon |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Results of Operations for Oil and Gas Producing Activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Crude oil and gas sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,322 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_GA | 167,386 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_GA | 192,489 us-gaap_OilAndGasSalesRevenue / us-gaap_StatementGeographicalAxis = country_GA
Production, G&A and other expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (150,602)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_GA | (52,776)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_GA | (27,425)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_StatementGeographicalAxis = country_GA
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,079)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_GA | (15,302)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_GA | (15,954)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_StatementGeographicalAxis = country_GA
Income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,486)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_GA | (34,115)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_GA | (81,813)us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_StatementGeographicalAxis = country_GA
Results from oil and gas producing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (65,845)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_GA | $ 65,193 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_GA | $ 67,297 us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_StatementGeographicalAxis = country_GA
[1] | Gabon crude oil sales are a function of the number and size of crude oil liftings in each quarter from the floating production, storage and offloading (“FPSO”) facility.

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- Definition Revenue from the sale of oil and gas during the 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62246-109447 + Details
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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Income tax expense for oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62259-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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- Definition Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 + Details
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