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Derivatives, Hedges and Financial Instruments - Additional Information (Detail) $ in Thousands, BTU in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) BTU MMBTU	Dec. 31, 2021 USD ($) MMBTU	Dec. 31, 2020 USD ($) MMBTU
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Natural gas purchase commitments volume | BTU	8.1
Gain (loss) on sale of natural gas	$ 0	$ 2,700	$ (1,600)
Realized gain on sale of natural gas	6,800
Unrealized loss on sale of natural gas			$ (1,200)
Financial instruments with fair values	$ 0	0
Natural Gas Purchase Commitments [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Realized gain on sale of natural gas		$ 1,500
Natural Gas Purchase Commitments [Member] | Level 2 [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Natural gas purchase commitments volume | MMBTU	0	0	7,300,000

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Financial instruments with fair values.

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- Definition

The amount of gains and losses (realized and unrealized) recognized in earnings during the period on natural gas forward contracts measured at fair value.

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Natural gas purchase commitment volume.

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Realized Gain (Loss) On Natural Gas Forward Contracts Held.

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The amount of unrealized gains and losses recognized in earnings during the period on natural gas forward contracts held as of period end measured at fair value.

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