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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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