Annual report pursuant to Section 13 and 15(d)

Schedule I - Parent Company Financial Statement (Statements Of Consolidated Cash Flows) (Detail)

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Schedule I - Parent Company Financial Statement (Statements Of Consolidated Cash Flows) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income (loss) $ (80,779) $ (33,668) $ (5,204) $ (39,005) $ (98,332) $ 3,109 $ 24,711 $ (7,038) $ (158,656) $ (77,550) $ 43,072
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation, depletion and amortization                 33,010 20,086 16,929
Deferred tax asset                 1,349    
Stock based compensation                 3,810 3,322 3,005
Change in operating assets and liabilities:                      
Other receivables                 (584) (1,250) (53)
Prepayments and other                 3,114 (4,172) 594
Accounts payable                 28,926 (8,907) 7,106
Accrued liabilities and other                 3,089 (596) 1,881
Net cash provided by operating activities                 38,875 23,390 75,400
CASH FLOWS FROM INVESTING ACTIVITIES                      
Decrease in restricted cash                 5,536 (9,219) (1,065)
Net cash used in investing activities                 (83,010) (101,398) (67,944)
CASH FLOWS FROM FINANCING ACTIVITIES                      
Proceeds from the issuances of common stock                 441 5,685 3,729
Purchases of treasury stock                   (1,868) (11,456)
Net cash provided by (used in) financing activities                 441 16,530 (7,727)
NET CHANGE IN CASH AND CASH EQUIVALENTS                 (43,694) (61,478) (271)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD       69,051       130,529 69,051 130,529 130,800
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 25,357       69,051       25,357 69,051 130,529
VAALCO ENERGY, INC.                      
CASH FLOWS FROM OPERATING ACTIVITIES                      
Net income (loss)                 (158,656) (77,550) 43,072
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation, depletion and amortization                 240 94 63
Deferred tax asset                 1,349    
Stock based compensation                 3,810 3,322 3,005
Equity in (earnings) loss from subsidiaries                 146,495 71,199 (48,852)
Change in operating assets and liabilities:                      
Other receivables                 293 (257) 180
Prepayments and other                 (236) (416) (16)
Accounts payable                 753 (34) 213
Accrued liabilities and other                 517 187 158
Net cash provided by operating activities                 (5,435) (3,455) (2,177)
CASH FLOWS FROM INVESTING ACTIVITIES                      
Investment in subsidiaries                 (7,044) (4,371) (8,245)
Decrease in restricted cash                 8,418    
Property and equipment expenditures                 (160) (816) (47)
Net cash used in investing activities                 1,214 (5,187) (8,292)
CASH FLOWS FROM FINANCING ACTIVITIES                      
Proceeds from the issuances of common stock                 441 5,685 3,729
Purchases of treasury stock                   (1,868) (11,456)
Net cash provided by (used in) financing activities                 441 3,817 (7,727)
NET CHANGE IN CASH AND CASH EQUIVALENTS                 (3,780) (4,825) (18,196)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD       $ 3,780       $ 8,605 $ 3,780 8,605 26,801
CASH AND CASH EQUIVALENTS AT END OF PERIOD         $ 3,780         $ 3,780 $ 8,605