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Segment Information (Segment Activity) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues-oil and natural gas sales | $ 14,635 | $ 11,000 | $ 17,546 | $ 44,458 | $ 62,922 |
Depreciation, depletion and amortization | 1,607 |  | 8,256 | 5,787 | 23,484 |
Impairment of proved properties | 88 |  | 17,988 | 88 | 29,208 |
Bad debt expense and other | 63 |  | 2,750 | 577 | 3,326 |
Other operating expense | 324 |  |  | 9,959 |  |
Operating income (loss) | 2,858 |  | (30,951) | (6,224) | (38,415) |
Interest income (expense), net | (327) |  | (462) | (2,285) | (1,107) |
Income tax expense | 2,198 |  | 2,707 | 6,884 | 10,345 |
Additions to properties and equipment | 681 |  | 10,804 | (1,672) | 44,357 |
Total assets | 78,202 |  |  | 78,202 |  | $ 123,958
Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | 76,455 |  |  | 76,455 |  | 115,573
Operating Segments [Member] | Gabon [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues-oil and natural gas sales | 14,540 |  | 17,405 | 44,212 | 62,496 |
Depreciation, depletion and amortization | 1,508 |  | 8,060 | 5,484 | 22,844 |
Impairment of proved properties |  |  | 17,988 |  | 29,208 |
Bad debt expense and other | 63 |  | 2,750 | 577 | 3,326 |
Other operating expense | 324 |  |  | 9,959 |  |
Operating income (loss) | 5,013 |  | (29,007) | 1,481 | (31,286) |
Interest income (expense), net | (329) |  | (294) | (2,285) | (944) |
Income tax expense | 2,305 |  | 2,707 | 6,884 | 10,345 |
Additions to properties and equipment | 674 |  | 10,796 | (1,819) | 44,215 |
Operating Segments [Member] | Gabon [Member] | Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | 55,833 |  |  | 55,833 |  | 98,858
Operating Segments [Member] | Equatorial Guinea [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating income (loss) | (184) |  | (287) | (319) | (944) |
Operating Segments [Member] | Equatorial Guinea [Member] | Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | 10,169 |  |  | 10,169 |  | 10,200
Operating Segments [Member] | United States [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues-oil and natural gas sales | 95 |  | 141 | 246 | 426 |
Depreciation, depletion and amortization | 38 |  | 140 | 121 | 467 |
Impairment of proved properties | 88 |  |  | 88 |  |
Operating income (loss) | (61) |  | 42 | (64) | (372) |
Additions to properties and equipment |  |  | 1 | 140 | (16) |
Operating Segments [Member] | United States [Member] | Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | 1,379 |  |  | 1,379 |  | 1,470
Corporate And Other [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Depreciation, depletion and amortization | 61 |  | 56 | 182 | 173 |
Operating income (loss) | (1,910) |  | (1,699) | (7,322) | (5,813) |
Interest income (expense), net | 2 |  | (168) |  | (163) |
Income tax expense | (107) |  |  |  |  |
Additions to properties and equipment | 7 |  | $ 7 | 7 | $ 158 |
Corporate And Other [Member] | Continuing Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total assets | $ 9,074 |  |  | $ 9,074 |  | $ 5,045

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