Business Segments - Business Segment Net Sales and Income (loss) before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Net sales	$ 97,228	$ 78,624	$ 289,696	$ 253,727
Income (loss) before income taxes	2,121	(1,175)	4,697	2,116
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	99,647	81,185	296,655	260,413
Income (loss) before income taxes	2,855	59	9,284	7,953
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	75,511	61,179	229,848	195,558
Income (loss) before income taxes	(62)	(2,832)	1,107	688
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	24,136	20,006	66,807	64,855
Income (loss) before income taxes	2,917	2,891	8,177	7,265
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
Income (loss) before income taxes	$ (734)	$ (1,234)	$ (4,587)	$ (5,837)