Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Unaudited) (Details)

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Quarterly Financial Information (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly financial information                      
Revenues, Net $ 53,553 $ 37,630 $ 58,818 $ 45,286 $ 67,767 $ 37,350 $ 58,547 $ 46,772 $ 195,287 $ 210,436 $ 134,472
Total operating costs and expenses 51,292 22,036 20,186 15,180 28,879 17,531 16,035 15,430 108,694 77,875 56,349
Operating income 2,261 15,594 38,632 30,106 38,888 19,819 42,512 31,342 86,593 132,561 78,123
Net income (18,917) 1,412 12,317 10,527 10,701 3,455 13,510 12,896 5,339 40,562 42,387
Less net income attributable to noncontrolling interest   (1,306) (1,893) (1,509) (1,981) (1,056) (1,723) (1,657) (4,708) (6,417) (5,047)
Net income attributable to VAALCO Energy, Inc. $ (18,917) $ 106 $ 10,424 $ 9,018 $ 8,720 $ 2,399 $ 11,787 $ 11,239 $ 631 $ 34,145 $ 37,340
Basic net income per share attributable to VAALCO Energy, Inc. $ (0.33)   $ 0.18 $ 0.16 $ 0.15 $ 0.04 $ 0.21 $ 0.20 $ 0.01 $ 0.60 $ 0.66
Diluted net income per share attributable to VAALCO Energy, Inc. $ (0.32)   $ 0.18 $ 0.15 $ 0.15 $ 0.04 $ 0.20 $ 0.19 $ 0.01 $ 0.59 $ 0.65