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, 2026 USD ($) bbl MMBTU	Dec. 31, 2025 USD ($) MMBTU bbl
Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | bbl	363	7,842
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl	12,228	1,913
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 1,026	$ 42,594
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (147,660)	$ (968)
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU	31,918	29,288
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU	5,030	8,000
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 11,194	$ 7,678
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (443)	$ (938)
Customer Counterparties [Member] | Oil Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | bbl	12,240	1,928
Oil/Natural Gas Derivative Liabilities, Notional Amount | bbl	351	7,828
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 149,492	$ 1,091
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (975)	$ (41,265)
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member]
Derivative Instruments [Line Items]
Oil/Natural Gas Derivative Assets, Notional Amount | MMBTU	5,030	8,000
Oil/Natural Gas Derivative Liabilities, Notional Amount | MMBTU	31,918	29,288
Oil/Natural Gas Derivative Assets, Estimated Fair Value	$ 472	$ 1,001
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value	$ (10,801)	$ (7,427)