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Property, Plant and Equipment - Additional Information (Detail) £ in Thousands, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2023 USD ($)	Aug. 31, 2022 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Oct. 14, 2022
Property Plant And Equipment [Line Items]
Property, plant and equipment			$ 482,979		$ 482,979			$ 468,007
Finance lease assets gross value			3,264		3,264			2,964
Finance lease, lease related accumulated depreciation			1,851		1,851			$ 1,498
Depreciation expense			7,021	$ 4,497	16,851	$ 13,692
Depreciation			$ 7,021	4,497	$ 16,851	13,692
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]			Long-Term Debt and Lease Obligation, Current		Long-Term Debt and Lease Obligation, Current		Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Depreciation on assets under finance leases			$ 81	$ 80	$ 237	$ 242
Sale And Leaseback Financing Obligations [Member]
Property Plant And Equipment [Line Items]
Remaining lease term									20 years
Sale And Leaseback Financing Obligations [Member] | Capital Expenditures [Member]
Property Plant And Equipment [Line Items]
Proceeds from disbursement agreement	$ 2,500
Estimated cost on upgrading existing equipment		$ 2,500
Land and Land Improvements and Buildings and Leasehold Improvements [Member] | Sale And Leaseback Financing Obligations [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment			55,158		55,158
Union Electric Steel UK Limited [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment			$ 10,851		10,851		£ 8,073
UES Domestic [Member] | Construction In Process Machinery And Equipment Or Buildings [Member]
Property Plant And Equipment [Line Items]
Machinery and equipment purchased					$ 24,239

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