Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2025 USD ($) MmbtuPerDay $ / MMBTU
Fair Value, Inputs, Level 3
Derivative [Line Items]
Net derivative liability \| $	$ 2.8
2026 Commodity Contract \| Call Swaptions
Derivative [Line Items]
Volume Hedged \| MmbtuPerDay	10,000
Weighted average price of hedge \| $ / MMBTU	4.12
Expiration of derivative non monetary notional amount	Nov. 30, 2025
2027 Commodity Contract \| Call Swaptions
Derivative [Line Items]
Volume Hedged \| MmbtuPerDay	160,000
Weighted average price of hedge \| $ / MMBTU	4.05
Expiration of derivative non monetary notional amount	Dec. 31, 2025

Expiration of derivative non monetary notional amount.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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