Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($) MmbtuPerDay $ / MMBTU
Fair Value, Inputs, Level 3
Derivative [Line Items]
Net derivative liability | $	$ 25.6
2026 Commodity Contract | Swaptions
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	135,000
Weighted average price of hedge | $ / MMBTU	4
Expiration of derivative non monetary notional amount	Aug. 31, 2025
2027 Commodity Contract | Swaptions
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	150,000
Weighted average price of hedge | $ / MMBTU	4.03
Expiration of derivative non monetary notional amount	Nov. 30, 2025