Derivative Activities - Derivative Volumes Hedged and Average Hedge Prices (Parenthetical) (Detail) - Natural Gas	9 Months Ended
	Sep. 30, 2023 MmbtuPerDay $ / MMBTU
2025 Commodity Contract
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	90,000
Weighted average price of hedge | $ / MMBTU	4.25
Expiration of derivative non monetary notional amount	Dec. 31, 2023
2026 Commodity Contract
Derivative [Line Items]
Volume Hedged | MmbtuPerDay	20,000
Weighted average price of hedge | $ / MMBTU	4.1
Expiration of derivative non monetary notional amount	Jun. 30, 2024