Derivative Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2026 USD ($) Derivative Customer	Mar. 31, 2025 USD ($) Customer
Derivative [Line Items]
Number of subsidiaries for purchases of natural gas under existing commitments \| Customer	1	2
Pre-tax termination gain	$ 559
Purchases of natural gas under existing commitments description	for one of its subsidiaries	for two of its subsidiaries
Number of subsidiaries for usage of electricity under existing commitments \| Customer	1	2
Usage of electricity under existing commitments description	for another one of its subsidiaries.	for two of its subsidiaries
Number of derivative instruments holds for trading purposes \| Derivative	0
Life of underlying asset	15 years
Gains on foreign exchange transactions included in other income net	$ 205	$ 221
Natural Gas Usage [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	25.00%	26.00%
Anticipated purchases, hedged	$ 680	$ 1,198
Time period for hedged usage description	natural gas usage through December 31, 2026	natural gas usage through December 31, 2025
Electricity Usage [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	36.00%	32.00%
Anticipated purchases, hedged	$ 1,678	$ 945
Time period for hedged usage description	electricity usage through December 31, 2027	electricity usage through December 31, 2025
Natural Gas And Electricity Purchased [Member]
Derivative [Line Items]
Purchase of natural gas or electricity	$ 549	$ 1,124
Aluminum Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	67.00%	50.00%
Time period for hedged purchases	8 months	4 months
Aluminum Purchases [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 1,192	$ 394

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Number of subsidiaries for usage of electricity under existing commitments.

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Percentage of anticipated requirements which are covered by cash flow hedges.

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Pre-tax termination gain.

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Usage of electricity under existing commitments description.

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Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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