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Derivatives Hedges and Financial Instruments - Additional Information (Detail) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($) MMBTU	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) MMBTU
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Gain (loss) on sale of natural gas		$ 2,700
Financial instruments with fair values	$ 0		$ 0
Natural Gas Purchase Commitments [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Natural gas purchase commitments volume | MMBTU	13,000,000.0
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

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- Definition

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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- Definition

Natural gas purchase commitment volume.

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- Definition

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

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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.

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