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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 | Dec. 31, 2023 USD ($) MMBTU bbl | Dec. 31, 2022 USD ($) 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 | 5,601 | 4,024
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 37,667 | $ 27,082
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 4,581 | 6,068
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (18,500) | $ (53,579)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 17,363 | 16,539
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 11,822 | $ 6,220
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 6,462 | 15,682
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (2,499) | $ (19,138)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | bbl | 4,618 | 6,068
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 18,722 | $ 54,219
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 5,564 | 4,024
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (36,877) | $ (26,551)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 6,462 | 15,682
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 2,499 | $ 19,164
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 17,363 | 16,539
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (11,571) | $ (6,124)

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