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Derivative Financial Instruments - Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions (Detail) bbl in Thousands, MMBTU in Thousands, $ in Thousands | Sep. 30, 2015 USD ($) MMBTU bbl | Dec. 31, 2014 USD ($) MMBTU bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 513 | 470
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 363 | 197
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 10,110 | $ 14,357
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (811) | $ (1,670)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 4,366 | 12,235
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 3,996 | 16,755
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 5,029 | $ 12,707
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,420) | $ (4,095)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 363 | 197
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 513 | 470
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 811 | $ 1,670
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (10,090) | $ (14,318)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 3,996 | 16,755
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 4,366 | 12,235
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,420 | $ 4,095
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (4,993) | $ (12,646)

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