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, 2025 USD ($) bbl MMBTU	Dec. 31, 2024 USD ($) bbl MMBTU
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets Notional Amount | bbl	7,842	7,097
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 42,594	$ 27,471
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl	1,913	4,768
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (968)	$ (12,897)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU	29,288	25,454
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 7,678	$ 3,804
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU	8,000	26,082
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (938)	$ (4,054)
Customer Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets Notional Amount | bbl	1,928	4,872
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 1,091	$ 12,973
Oil/Natural Gas Derivative Liabilities Notional Amount | bbl	7,828	6,993
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (41,265)	$ (26,753)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets Notional Amount | MMBTU	8,000	26,767
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 1,001	$ 4,255
Oil/Natural Gas Derivative Liabilities Notional Amount | MMBTU	29,288	24,769
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (7,427)	$ (3,600)