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Business Segments - Schedule of Financial Information for Corporation's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
Revenue from External Customer [Line Items]
Restructuring charges			$ 6,750		$ 6,750
Investments in joint ventures		$ 835		$ 835			$ 835
Deconsolidation Charge				875
Noncurrent asbestos-related insurance receivables		97,965		97,965			107,838
Employee retention credits			735		735
Depreciation and Amortization Expense [Member]
Revenue from External Customer [Line Items]
Accelerated depreciation			654		654
Union Electric Steel U K Limited [Member]
Revenue from External Customer [Line Items]
Estimated recovery distributed	$ 1,255
Estimated recovery under credit agreement		5,370		5,370		$ 5,370	7,500
Asbestos Claims [Member]
Revenue from External Customer [Line Items]
Insurance receivable - asbestos		$ 116,965	130,143	116,965	130,143		126,838	$ 139,295
U.S. [Member]
Revenue from External Customer [Line Items]
Deconsolidation Charge				$ 875
Employee retention credits			735		735
Non-US [Member]
Revenue from External Customer [Line Items]
Restructuring charges			$ 6,750		$ 6,750
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		$ 835		$ 835			835
Estimated recovery under credit agreement		$ 5,370		$ 5,370			$ 7,500
Employee retention credits			$ 456		$ 456
Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Employee retention credits			$ 279		$ 279