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Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Recurring - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
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 | 1,029 | $ 1,084
Total | 2,314 | $ 1,084
Level 2 [Member] |  |
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 |
Total | 1,285 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | 1,029 |
Total | $ 1,029 |

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