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Segment Information - Segment Activity (Detail) (USD $) In Thousands, 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
Segment Reporting 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
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 16,929 | 19,913 | 25,596
Operating income (loss) | 35,951 | 8,104 | 11,666 | 21,503 | 2,261 | 15,594 | 38,632 | 30,106 | 77,225 | 86,593 | 132,561
Interest income |  |  |  |  |  |  |  |  | 73 | 145 | 184
Income taxes |  |  |  |  |  |  |  |  | 34,115 | 81,813 | 93,468
Bad debt and other expenses |  |  |  |  |  |  |  |  | 3,326 | 1,621 | 4,448
Impairment of proved properties |  |  |  |  |  |  |  |  |  | 7,620 | 4,975
Additions to properties and equipment |  |  |  |  |  |  |  |  | 53,691 | 46,366 | 32,966
Long lived assets | 138,524 |  |  |  | 106,608 |  |  |  | 138,524 | 106,608 | 99,848
Total assets | 308,167 |  |  |  | 267,956 |  |  |  | 308,167 | 267,956 | 275,015
Operating Segments | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 63 | 59 | 50
Operating income (loss) |  |  |  |  |  |  |  |  | (5,915) | (8,405) | (9,088)
Interest income |  |  |  |  |  |  |  |  | 33 | 86 | 104
Additions to properties and equipment |  |  |  |  |  |  |  |  | 47 | 77 | 60
Long lived assets | 152 |  |  |  | 166 |  |  |  | 152 | 166 | 147
Total assets | 20,211 |  |  |  | 38,585 |  |  |  | 20,211 | 38,585 | 45,986
Operating Segments | Gabon |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 167,386 | 192,489 | 208,781
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 15,310 | 15,954 | 23,604
Operating income (loss) |  |  |  |  |  |  |  |  | 98,795 | 147,985 | 155,550
Interest income |  |  |  |  |  |  |  |  | 40 | 60 | 80
Income taxes |  |  |  |  |  |  |  |  | 34,115 | 81,813 | 93,468
Bad debt and other expenses |  |  |  |  |  |  |  |  | 1,764 |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  | 53,015 | 22,731 | 8,528
Long lived assets | 109,597 |  |  |  | 71,225 |  |  |  | 109,597 | 71,225 | 68,965
Total assets | 256,033 |  |  |  | 190,652 |  |  |  | 256,033 | 190,652 | 185,341
Operating Segments | Angola |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  | 28 | 28 | 20
Operating income (loss) |  |  |  |  |  |  |  |  | (3,018) | (3,293) | (6,221)
Interest income |  |  |  |  |  |  |  |  |  | (1) |
Bad debt and other expenses |  |  |  |  |  |  |  |  | 1,562 | 1,621 | 4,448
Additions to properties and equipment |  |  |  |  |  |  |  |  | 629 |  | 7
Long lived assets | 11,540 |  |  |  | 10,938 |  |  |  | 11,540 | 10,938 | 10,964
Total assets | 12,204 |  |  |  | 11,405 |  |  |  | 12,204 | 11,405 | 21,452
Operating Segments | Equatorial Guinea |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (768) | (754) |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  | 10,000 |
Long lived assets | 10,000 |  |  |  | 10,000 |  |  |  | 10,000 | 10,000 |
Total assets | 10,059 |  |  |  | 10,000 |  |  |  | 10,059 | 10,000 |
Operating Segments | USA |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,798 | 1,655
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  | 3,872 | 1,922
Operating income (loss) |  |  |  |  |  |  |  |  |  | (48,940) | (7,680)
Impairment of proved properties |  |  |  |  |  |  |  |  |  | 7,620 | 4,975
Additions to properties and equipment |  |  |  |  |  |  |  |  |  | 13,558 | 24,371
Long lived assets |  |  |  |  | 14,279 |  |  |  |  | 14,279 | 19,772
Total assets |  |  |  |  | $ 17,314 |  |  |  |  | $ 17,314 | $ 22,236

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