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SCHEDULE I - PARENT COMPANY FINANCIAL STATEMENT- STATEMENTS OF CONSOLIDATED CASH FLOWS (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
Net income (loss) | $ (77,550)us-gaap_ProfitLoss | $ 43,072 us-gaap_ProfitLoss | $ 5,339 us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
Depreciation, depletion and amortization | 20,086 us-gaap_DepreciationDepletionAndAmortization | 16,929 us-gaap_DepreciationDepletionAndAmortization | 19,913 us-gaap_DepreciationDepletionAndAmortization
Stock based compensation | 3,322 us-gaap_ShareBasedCompensation | 3,005 us-gaap_ShareBasedCompensation | 2,406 us-gaap_ShareBasedCompensation
Change in operating assets and liabilities: |  |  |
Other receivables | (1,250)us-gaap_IncreaseDecreaseInOtherReceivables | (53)us-gaap_IncreaseDecreaseInOtherReceivables | (199)us-gaap_IncreaseDecreaseInOtherReceivables
Prepayments and other | (4,172)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 594 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (766)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and other liabilities | (9,503)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 8,988 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 39 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Decrease/(increase) in restricted cash | (9,219)us-gaap_IncreaseDecreaseInRestrictedCash | (1,065)us-gaap_IncreaseDecreaseInRestrictedCash | 78 us-gaap_IncreaseDecreaseInRestrictedCash
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from the issuance of common stock | 5,685 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,729 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,335 us-gaap_ProceedsFromIssuanceOfCommonStock
Purchase of treasury stock | (1,868)us-gaap_PaymentsForRepurchaseOfCommonStock | (11,456)us-gaap_PaymentsForRepurchaseOfCommonStock |
Distribution to noncontrolling interest |  |  | (5,595)us-gaap_PaymentsOfDividendsMinorityInterest
Acquisition of noncontrolling interest |  |  | (26,200)us-gaap_PaymentsToMinorityShareholders
NET CHANGE IN CASH AND CASH EQUIVALENTS | (61,478)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (270)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (6,339)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 130,529 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,800 us-gaap_CashAndCashEquivalentsAtCarryingValue | 137,139 us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 69,051 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,529 us-gaap_CashAndCashEquivalentsAtCarryingValue | 130,800 us-gaap_CashAndCashEquivalentsAtCarryingValue
VAALCO ENERGY, INC. |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
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
Adjustments to reconcile net income to net cash provided by operating activities |  |  |
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
Stock based compensation | 3,322 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,005 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,406 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in (earnings) loss from subsidiaries | 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
Change in operating assets and liabilities: |  |  |
Other receivables | (257)us-gaap_IncreaseDecreaseInOtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 180 us-gaap_IncreaseDecreaseInOtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 27 us-gaap_IncreaseDecreaseInOtherReceivables / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Prepayments and other | (416)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts payable and other liabilities | 153 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 371 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,710)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) operating activities | (3,455)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,177)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,242)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Investment in subsidiaries | (4,371)us-gaap_PaymentsForHedgeInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,245)us-gaap_PaymentsForHedgeInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Return of investment in subsidiaries |  |  | 19,307 us-gaap_ProceedsFromHedgeInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Decrease/(increase) in restricted cash |  |  | (10,000)us-gaap_IncreaseDecreaseInRestrictedCash / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Property and equipment expenditures | (816)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (47)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (77)us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) investing activities | (5,187)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8,292)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,230 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Proceeds from the issuance of common stock | 5,685 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,729 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,335 us-gaap_ProceedsFromIssuanceOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchase of treasury stock | (1,868)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (11,456)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Distribution to noncontrolling interest |  |  | (5,595)us-gaap_PaymentsOfDividendsMinorityInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Acquisition of noncontrolling interest |  |  | (26,200)us-gaap_PaymentsToMinorityShareholders / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities | 3,817 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,727)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (28,460)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
NET CHANGE IN CASH AND CASH EQUIVALENTS | (4,825)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (18,196)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (27,472)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 8,605 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 26,801 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 54,273 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ 3,780 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 8,605 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 26,801 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The cash inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3581-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + 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 Reference 2: 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 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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