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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, 2022 USD ($) bbl MMBTU | Dec. 31, 2021 USD ($) 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 | 4,024 | 4,809
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 27,082 | $ 14,721
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 6,068 | 7,032
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (53,579) | $ (73,594)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 16,539 | 15,947
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 6,220 | $ 4,143
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 15,682 | 29,446
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (19,138) | $ (21,249)
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | bbl | 6,068 | 7,046
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 54,219 | $ 74,437
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl | 4,024 | 4,796
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (26,551) | $ (14,294)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU | 15,682 | 29,446
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 19,164 | $ 21,456
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU | 16,539 | 15,947
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (6,124) | $ (4,124)

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