Business Segments - Summary of Net Sales By Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Revenue from External Customer [Line Items]
Net Sales	$ 102,918	$ 113,104	$ 211,245	$ 217,369
Income (Loss) Before Income Taxes	2,826	(6,128)	3,261	(4,178)
Capital Expenditures			9,134	3,661
Depreciation and amortization	4,226	5,368	8,484	10,004
Identifiable Assets	490,862		490,862		$ 495,355
United States [Member]
Revenue from External Customer [Line Items]
Net Sales	65,868	61,727	136,297	121,623
Income (Loss) Before Income Taxes	(663)	(48)	(2,686)	349
Foreign [Member]
Revenue from External Customer [Line Items]
Net Sales	37,050	51,377	74,948	95,746
Income (Loss) Before Income Taxes	3,489	(6,080)	5,947	(4,527)
Continuing Operations [Member]
Revenue from External Customer [Line Items]
Identifiable Assets	490,862		490,862		495,355
Long-lived Assets	239,051		239,051		251,837
Continuing Operations [Member] | United States [Member]
Revenue from External Customer [Line Items]
Long-lived Assets	199,884		199,884		211,461
Continuing Operations [Member] | Foreign [Member]
Revenue from External Customer [Line Items]
Long-lived Assets	39,167		39,167		40,376
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net Sales	102,918	113,104	211,245	217,369
Operating Segments [Member] | Forged and Cast Mill Rolls [Member]
Revenue from External Customer [Line Items]
Net Sales	61,401	72,227	127,769	140,849
Capital Expenditures			4,254	2,646
Depreciation and amortization	3,863	5,084	7,787	9,452
Operating Segments [Member] | Forged and Cast Mill Rolls [Member] | Continuing Operations [Member]
Revenue from External Customer [Line Items]
Identifiable Assets	267,934		267,934		272,303
Operating Segments [Member] | FEP [Member]
Revenue from External Customer [Line Items]
Net Sales	5,910	5,682	10,351	9,347
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net Sales	67,311	77,909	138,120	150,196
Depreciation and amortization	3,863	5,084	7,787	9,452
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net Sales	35,607	35,195	73,125	67,173
Capital Expenditures			4,880	1,015
Depreciation and amortization	350	284	677	552
Operating Segments [Member] | Air and Liquid Processing [Member] | Continuing Operations [Member]
Revenue from External Customer [Line Items]
Identifiable Assets	216,392		216,392		215,833
Operating Segments [Member] | Air Handling Systems [Member]
Revenue from External Customer [Line Items]
Net Sales	11,904	13,882	24,947	24,510
Operating Segments [Member] | Heat Exchange Coils [Member]
Revenue from External Customer [Line Items]
Net Sales	12,555	11,299	25,623	22,824
Operating Segments [Member] | Centrifugal Pumps [Member]
Revenue from External Customer [Line Items]
Net Sales	11,148	$ 10,014	22,555	$ 19,839
Corporate Costs, Including Other Income (Expense) [Member]
Revenue from External Customer [Line Items]
Depreciation and amortization	13		20
Corporate Costs, Including Other Income (Expense) [Member] | Continuing Operations [Member]
Revenue from External Customer [Line Items]
Identifiable Assets	$ 6,536		$ 6,536		$ 7,219