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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, 2020 USD ($) bbl MMBTU | Dec. 31, 2019 USD ($) bbl MMBTU
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 2,296 | 1,214
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 3,089 | 2,148
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 18,718 | $ 2,796
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (9,132) | $ (6,916)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 5,623 | 8,295
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 18,181 | 2,689
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 932 | $ 2,131
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (5,879) | $ (70)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 3,106 | 2,172
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 2,279 | 1,190
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 9,461 | $ 7,208
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (18,506) | $ (2,652)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 19,940 | 2,689
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 3,864 | 8,295
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 6,161 | $ 83
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (915) | $ (2,039)

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