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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 | Jun. 30, 2020 USD ($) MMBTU bbl | Dec. 31, 2019 USD ($) 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 | 2,512 | 1,214
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 2,054 | 2,148
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 30,220 | $ 2,796
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (7,022) | $ (6,916)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 10,414 | 8,295
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 10,776 | 2,689
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 2,553 | $ 2,131
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (1,205) | $ (70)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | bbl | 2,054 | 2,172
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl | 2,512 | 1,190
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 7,193 | $ 7,208
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (29,916) | $ (2,652)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU | 12,298 | 2,689
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU | 8,891 | 8,295
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 1,358 | $ 83
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (2,417) | $ (2,039)

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