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Derivatives, Hedges and Financial Instruments - Additional Information (Detail) $ in Thousands, BTU in Millions | 12 Months Ended
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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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- 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Details
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