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Quarterly Financial Information (Unaudited) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 58,282 | $ 37,740 | $ 29,118 | $ 44,137 | $ 53,553 | $ 37,630 | $ 58,818 | $ 45,286 | $ 169,277 | $ 195,287 | $ 210,436
Total operating costs and expenses | 22,331 | 29,636 | 17,452 | 22,634 | 51,292 | 22,036 | 20,186 | 15,180 | 92,052 | 108,694 | 77,875
Operating income | 35,951 | 8,104 | 11,666 | 21,503 | 2,261 | 15,594 | 38,632 | 30,106 | 77,225 | 86,593 | 132,561
Net income | 26,377 | 2,386 | 7,121 | 7,188 | (18,917) | 1,412 | 12,317 | 10,527 | 43,072 | 5,339 | 40,562
Basic net income per share | $ 0.46 | $ 0.4 | $ 0.12 | $ 0.12 | $ (0.33) |  | $ 0.18 | $ 0.16 | $ 0.75 | $ 0.01 | $ 0.60
Diluted net income per share | $ 0.46 | $ 0.4 | $ 0.12 | $ 0.12 | $ (0.32) |  | $ 0.18 | $ 0.15 | $ 0.74 | $ 0.01 | $ 0.59
Less net income attributable to noncontrolling interest |  |  |  |  |  | (1,306) | (1,893) | (1,509) |  | (4,708) | (6,417)
Net income attributable to VAALCO Energy, Inc. |  |  |  |  | $ (18,917) | $ 106 | $ 10,424 | $ 9,018 | $ 43,072 | $ 631 | $ 34,145

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