Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions, $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2026
USD ($)
MMBTU
$ / MMBTU
| |
| Commitments And Contingencies [Line Items] | |
| Accrued liabilities for environmental matters | $ 0.4 |
| Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other Accrued Liabilities, Current, Accrued And Other Liabilities Noncurrent |
| Percentage of payment of investigation costs agreed by Hallowell Facility | 50.00% |
| Indemnify the sureties for payments | $ 10.2 |
| Natural Gas Purchase Commitments [Member] | |
| Commitments And Contingencies [Line Items] | |
| Natural gas purchase commitments volume | MMBTU | 1.5 |
| Weighted average price of natural gas per unit | $ / MMBTU | 3.23 |
| Weighted average purchase price of natural gas | $ 4.7 |
| Weighted average natural gas market price per unit | $ / MMBTU | 3.1 |
| Weighted average natural gas market price | $ 4.5 |