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Business Segments - Schedule of Financial Information for Corporation's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Revenue from External Customer [Line Items] |  |  |  |  |  |
Restructuring charges | $ 3,069 |  | $ 9,819 |  |  |
Investments in joint ventures | 2,175 |  | 2,175 |  | $ 2,175 |
Noncurrent asbestos-related insurance receivables | 109,947 |  | 109,947 |  | 124,295 |
Employee retention credits |  |  | 735 |  |  |
Union Electric Steel UK Limited [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Restructuring charges | 2,253 |  | 9,003 |  |  |
Depreciation and Amortization Expense [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Accelerated depreciation | 2,407 |  | 3,061 |  |  |
Asbestos Claims [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Insurance receivable - asbestos | 124,947 | $ 146,404 | 124,947 | $ 146,404 | 139,295 | $ 160,245
U.S. [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Restructuring charges | $ 816 |  | $ 816 |  |  |
Sales Revenue, Net [Member] | Individual Foreign Countries [Member] | Maximum [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Net sales | 10.00% | 10.00% | 10.00% | 10.00% |  |
Forged and Cast Engineered Products [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Investments in joint ventures | $ 2,175 |  | $ 2,175 |  | $ 2,175 |
Employee retention credits |  |  | 456 |  |  |
Air and Liquid Processing [Member] |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |
Employee retention credits |  |  | $ 279 |  |  |

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