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v3.25.3

Exit Charges - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2025 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2025 USD ($) Employee | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | $ 3,069 | $ 9,819 |  |
Outstanding exit charges |  | 5,969 | 5,969 | $ 5,922 | $ 0
Accumulated other comprehensive loss |  | (58,044) | (58,044) |  | $ (66,836)
Union Electric Steel UK Limited [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | 2,253 | $ 9,003 |  |
Number of employees under existing benefit plans | Employee |  |  | 168 |  |
Carrying value of investment |  | 23,000 | $ 23,000 |  |
Estimated fair value of liabilities and assets |  | 0 | 0 |  |
Accumulated other comprehensive loss |  | 29,000 | 29,000 |  |
Alloys Unlimited and Processing, LLC.[Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Closure costs |  | 800 | $ 800 |  |
Number of employees under existing benefit plans | Employee |  |  | 15 |  |
Accrued Payrolls and Employee Benefits [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Outstanding exit charges |  | 5,121 | $ 5,121 |  |
Other Noncurrent Liabilities [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Outstanding exit charges |  | 848 | 848 |  |
Minimum [Member] | Revolving Credit Facility [Member] | Union Electric Steel UK Limited [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Amount of funds expected to be returned to the lenders |  | 7,000 | 7,000 |  |
Minimum [Member] | Forecast [Member] | Union Electric Steel UK Limited [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Non-cash impairment charge | $ 43,000 |  |  |  |
Maximum [Member] | Revolving Credit Facility [Member] | Union Electric Steel UK Limited [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Amount of funds expected to be returned to the lenders |  | $ 9,000 | $ 9,000 |  |
Maximum [Member] | Forecast [Member] | Union Electric Steel UK Limited [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Non-cash impairment charge | $ 45,000 |  |  |  |

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