Business Segments - Business Segment Net Sales and Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Net sales	$ 102,200	$ 97,228	$ 311,491	$ 289,696
Net sales	102,218	99,647	314,232	296,655
Income before income taxes	1,311	2,398	3,757	5,682
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	102,218	99,647	314,232	296,655
Income before income taxes	4,904	3,132	16,962	10,269
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	73,625	75,511	228,004	229,848
Income before income taxes	1,448	215	7,576	2,092
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	28,593	24,136	86,228	66,807
Income before income taxes	3,456	2,917	9,386	8,177
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
Income before income taxes	$ (3,593)	$ (734)	$ (13,205)	$ (4,587)