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SCHEDULE I - PARENT COMPANY FINANCIAL STATEMENT- STATEMENTS OF CONSOLIDATED OPERATIONS (Details) (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
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,086 us-gaap_DepreciationDepletionAndAmortization | 16,929 us-gaap_DepreciationDepletionAndAmortization | 19,913 us-gaap_DepreciationDepletionAndAmortization
General and administrative expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,194 us-gaap_GeneralAndAdministrativeExpense | 11,254 us-gaap_GeneralAndAdministrativeExpense | 11,779 us-gaap_GeneralAndAdministrativeExpense
Total operating costs and expenses | 117,308 us-gaap_CostsAndExpenses |  | 17,799 us-gaap_CostsAndExpenses |  | 18,270 us-gaap_CostsAndExpenses |  | 28,721 us-gaap_CostsAndExpenses |  | 22,331 us-gaap_CostsAndExpenses |  | 29,636 us-gaap_CostsAndExpenses |  | 17,452 us-gaap_CostsAndExpenses |  | 22,634 us-gaap_CostsAndExpenses |  | 182,097 us-gaap_CostsAndExpenses | 92,052 us-gaap_CostsAndExpenses | 108,694 us-gaap_CostsAndExpenses
Operating income (loss) | (94,270)us-gaap_OperatingIncomeLoss |  | 6,687 us-gaap_OperatingIncomeLoss |  | 33,828 us-gaap_OperatingIncomeLoss |  | (650)us-gaap_OperatingIncomeLoss |  | 35,951 us-gaap_OperatingIncomeLoss |  | 8,104 us-gaap_OperatingIncomeLoss |  | 11,666 us-gaap_OperatingIncomeLoss |  | 21,503 us-gaap_OperatingIncomeLoss |  | (54,406)us-gaap_OperatingIncomeLoss | 77,225 us-gaap_OperatingIncomeLoss | 86,593 us-gaap_OperatingIncomeLoss
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75 us-gaap_InvestmentIncomeInterest | 73 us-gaap_InvestmentIncomeInterest | 145 us-gaap_InvestmentIncomeInterest
Other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (733)us-gaap_OtherNonoperatingIncomeExpense | (111)us-gaap_OtherNonoperatingIncomeExpense | 414 us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (658)us-gaap_NonoperatingIncomeExpense | (38)us-gaap_NonoperatingIncomeExpense | 559 us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (55,064)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 77,187 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 87,152 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,486 us-gaap_IncomeTaxExpenseBenefit | 34,115 us-gaap_IncomeTaxExpenseBenefit | 81,813 us-gaap_IncomeTaxExpenseBenefit
Net income (loss) | (98,332)us-gaap_ProfitLoss |  | 3,109 us-gaap_ProfitLoss |  | 24,712 us-gaap_ProfitLoss |  | (7,038)us-gaap_ProfitLoss |  | 26,377 us-gaap_ProfitLoss |  | 2,386 us-gaap_ProfitLoss |  | 7,121 us-gaap_ProfitLoss |  | 7,188 us-gaap_ProfitLoss |  | (77,550)us-gaap_ProfitLoss | 43,072 us-gaap_ProfitLoss | 5,339 us-gaap_ProfitLoss
Less net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,708)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to VAALCO Energy, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (77,550)us-gaap_NetIncomeLoss | 43,072 us-gaap_NetIncomeLoss | 631 us-gaap_NetIncomeLoss
VAALCO ENERGY, INC. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 63 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 59 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
General and administrative expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,740 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,750 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,065 us-gaap_GeneralAndAdministrativeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating costs and expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,834 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,813 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,124 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,834)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (5,813)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,124)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 86 us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450 us-gaap_OtherNonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Equity in subsidiary earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (71,199)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 48,852 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,377 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (70,716)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 48,885 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 13,463 us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (77,550)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,072 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,339 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (77,550)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,072 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,339 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Less net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,708)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income (loss) attributable to VAALCO Energy, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (77,550)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 43,072 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 631 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
[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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