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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 23,037 us-gaap_OilAndGasSalesRevenue | [1] | $ 24,486 us-gaap_OilAndGasSalesRevenue | [1] | $ 52,098 us-gaap_OilAndGasSalesRevenue | [1] | $ 28,071 us-gaap_OilAndGasSalesRevenue | [1] | $ 58,282 us-gaap_OilAndGasSalesRevenue | [1] | $ 37,740 us-gaap_OilAndGasSalesRevenue | [1] | $ 29,118 us-gaap_OilAndGasSalesRevenue | [1] | $ 44,137 us-gaap_OilAndGasSalesRevenue | [1] | $ 127,691 us-gaap_OilAndGasSalesRevenue | $ 169,277 us-gaap_OilAndGasSalesRevenue | $ 195,287 us-gaap_OilAndGasSalesRevenue
Total operating costs and expenses | 117,308 us-gaap_CostsAndExpenses |  | 17,799 us-gaap_CostsAndExpenses |  | 18,270 us-gaap_CostsAndExpenses |  | 28,721 us-gaap_CostsAndExpenses |  | 22,331 us-gaap_CostsAndExpenses |  | 29,636 us-gaap_CostsAndExpenses |  | 17,452 us-gaap_CostsAndExpenses |  | 22,634 us-gaap_CostsAndExpenses |  | 182,097 us-gaap_CostsAndExpenses | 92,052 us-gaap_CostsAndExpenses | 108,694 us-gaap_CostsAndExpenses
Operating income (loss) | (94,270)us-gaap_OperatingIncomeLoss |  | 6,687 us-gaap_OperatingIncomeLoss |  | 33,828 us-gaap_OperatingIncomeLoss |  | (650)us-gaap_OperatingIncomeLoss |  | 35,951 us-gaap_OperatingIncomeLoss |  | 8,104 us-gaap_OperatingIncomeLoss |  | 11,666 us-gaap_OperatingIncomeLoss |  | 21,503 us-gaap_OperatingIncomeLoss |  | (54,406)us-gaap_OperatingIncomeLoss | 77,225 us-gaap_OperatingIncomeLoss | 86,593 us-gaap_OperatingIncomeLoss
Net income (loss) | $ (98,332)us-gaap_ProfitLoss |  | $ 3,109 us-gaap_ProfitLoss |  | $ 24,712 us-gaap_ProfitLoss |  | $ (7,038)us-gaap_ProfitLoss |  | $ 26,377 us-gaap_ProfitLoss |  | $ 2,386 us-gaap_ProfitLoss |  | $ 7,121 us-gaap_ProfitLoss |  | $ 7,188 us-gaap_ProfitLoss |  | $ (77,550)us-gaap_ProfitLoss | $ 43,072 us-gaap_ProfitLoss | $ 5,339 us-gaap_ProfitLoss
Basic net income (loss) per share | $ (1.70)us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare |  | $ 0.05 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare |  | $ 0.43 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare |  | $ (0.12)us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare |  |  |  |  |  |  |  |  |  |  |  |
Diluted net income (loss) per share | $ (1.70)us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare |  | $ 0.05 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare |  | $ 0.43 us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare |  | $ (0.12)us-gaap_IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  |  |  |  |  |  |  |  | $ 0.46 us-gaap_EarningsPerShareBasic |  | $ 0.04 us-gaap_EarningsPerShareBasic |  | $ 0.12 us-gaap_EarningsPerShareBasic |  | $ 0.12 us-gaap_EarningsPerShareBasic |  | $ (1.36)us-gaap_EarningsPerShareBasic | $ 0.75 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic
Diluted net income per share |  |  |  |  |  |  |  |  | $ 0.46 us-gaap_EarningsPerShareDiluted |  | $ 0.04 us-gaap_EarningsPerShareDiluted |  | $ 0.12 us-gaap_EarningsPerShareDiluted |  | $ 0.12 us-gaap_EarningsPerShareDiluted |  | $ (1.36)us-gaap_EarningsPerShareDiluted | $ 0.74 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted
[1] | Gabon crude oil sales are a function of the number and size of crude oil liftings in each quarter from the floating production, storage and offloading (“FPSO”) facility.

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