Commitments and Contingencies - Additional Information (Detail) MMBTU in Millions, $ in Millions	9 Months Ended
Sep. 30, 2025 USD ($) MMBTU $ / MMBTU
Commitments And Contingencies [Line Items]
Accrued liabilities for environmental matters	$ 0.6
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%
Natural Gas Purchase Commitments [Member]
Commitments And Contingencies [Line Items]
Natural gas purchase commitments volume \| MMBTU	0.9
Weighted average price of natural gas per unit \| $ / MMBTU	3.45
Weighted average purchase price of natural gas	$ 3.0
Weighted average natural gas market price per unit \| $ / MMBTU	3.26
Weighted average natural gas market price	$ 2.8

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (d)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-10

Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Subparagraph (d)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-10

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 16
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481899/410-30-55-16

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480102/450-20-S99-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 410
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481931/410-30-50-7

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