Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Swaptions $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) MmbtuPerDay $ / MMBTU
Fair Value, Inputs, Level 3
Derivative [Line Items]
Net derivative liability	$ 13.2
2026 Commodity Contract
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	150,000
Weighted average price of hedge | $ / MMBTU	4
2026 Commodity Contract | Fair Value, Inputs, Level 3
Derivative [Line Items]
Net derivative liability	$ 13.2
2026 Commodity Contract | Maximum
Derivative [Line Items]
Expiration of derivative non monetary notional amount	Aug. 31, 2025
2026 Commodity Contract | Minimum
Derivative [Line Items]
Expiration of derivative non monetary notional amount	Jun. 30, 2025