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Schedule I - Parent Company Financial Statement (Statements Of Condensed Unconsolidated Cash Flows) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 3,431 | $ (322) | $ 2,283 | $ 4,259 | $ (3,641) | $ (14,767) | $ (518) | $ (7,624) | $ 9,651 | $ (26,550) | $ (158,656)
Adjustments to reconcile net income (loss) to net cash provided by |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 6,457 | 6,926 | 32,998
Deferred tax asset |  |  |  |  |  |  |  |  | (1,260) |  | 1,349
Stock-based compensation |  |  |  |  |  |  |  |  | 1,098 | 192 | 3,810
Commodity derivatives net (gain) loss |  |  |  |  |  |  |  |  | (1,032) | (1,711) |
Cash settlements received on matured derivative contracts |  |  |  |  |  |  |  |  | 195 |  |
Change in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Other receivables |  |  |  |  |  |  |  |  | (43) | (18) | (609)
Prepayments and other |  |  |  |  |  |  |  |  | 1,646 | 517 | 3,129
Accounts payable |  |  |  |  |  |  |  |  | (7,297) | (15,459) | 30,187
Accrued liabilities and other |  |  |  |  |  |  |  |  | 2,050 | (4,586) | 3,034
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 6,659 | (3,452) | 38,875
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Decrease in restricted cash |  |  |  |  |  |  |  |  | (150) | 15,219 | 5,536
Net cash used in investing activities |  |  |  |  |  |  |  |  | (1,649) | (1,287) | (83,010)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuances of common stock |  |  |  |  |  |  |  |  | 39 |  | 441
Treasury shares |  |  |  |  |  |  |  |  | (20) | (51) |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (5,815) | (144) | 441
NET CHANGE IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (805) | (4,883) | (43,694)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | 20,474 |  |  |  | $ 25,357 | 20,474 | 25,357 | 69,051
CASH AND CASH EQUIVALENTS AT END OF YEAR | 19,669 |  |  |  | 20,474 |  |  |  | 19,669 | 20,474 | 25,357
VAALCO ENERGY, INC. [Member] |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 9,651 | (26,550) | (158,656)
Adjustments to reconcile net income (loss) to net cash provided by |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 260 | 244 | 240
Other operating loss, net |  |  |  |  |  |  |  |  | 12 |  |
Deferred tax asset |  |  |  |  |  |  |  |  | (1,260) |  | 1,349
Stock-based compensation |  |  |  |  |  |  |  |  | 1,098 | 192 | 3,810
Equity in (earnings) loss from subsidiaries |  |  |  |  |  |  |  |  | (18,196) | 16,732 | 146,495
Commodity derivatives net (gain) loss |  |  |  |  |  |  |  |  | 1,032 |  |
Cash settlements received on matured derivative contracts |  |  |  |  |  |  |  |  | 195 |  |
Change in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Other receivables |  |  |  |  |  |  |  |  | (80) | (21) | 293
Prepayments and other |  |  |  |  |  |  |  |  | (130) | (955) | (236)
Accounts payable |  |  |  |  |  |  |  |  | (212) | (658) | 753
Accrued liabilities and other |  |  |  |  |  |  |  |  | (272) | (1,855) | 517
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | (7,902) | (12,871) | (5,435)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Investment in subsidiaries |  |  |  |  |  |  |  |  |  |  | (7,044)
Return of investment in subsidiaries |  |  |  |  |  |  |  |  | 7,598 | 12,556 |
Decrease in restricted cash |  |  |  |  |  |  |  |  | (50) | 1,582 | 8,418
Property and equipment expenditures |  |  |  |  |  |  |  |  | (127) | (178) | (160)
Net cash used in investing activities |  |  |  |  |  |  |  |  | 7,421 | 13,960 | 1,214
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |  |  |  |  |  |  |  |
Proceeds from the issuances of common stock |  |  |  |  |  |  |  |  | 39 |  | 441
Treasury shares |  |  |  |  |  |  |  |  | (20) | (51) |
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 19 | (51) | 441
NET CHANGE IN CASH AND CASH EQUIVALENTS |  |  |  |  |  |  |  |  | (462) | 1,038 | (3,780)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR |  |  |  | $ 1,038 |  |  |  |  | 1,038 |  | $ 3,780
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ 576 |  |  |  | $ 1,038 |  |  |  | $ 576 | $ 1,038 |

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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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