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Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | $ 2,181 | $ 1,029
Fair Value, Recurring |  |
Assets - Supplies, prepaid items and other: |  |
Natural gas contracts |  | 80
Total |  | 80
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Natural gas contracts |  | 1,285
Embedded derivative | 2,181 | 1,029
Total | 2,181 | $ 2,314
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | 2,181 |
Total | $ 2,181 |

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