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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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