Business Segments - Business Segment Net Sales and Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue from External Customer [Line Items]
Net sales	$ 92,178	$ 84,717
Income before income taxes	1,665	695
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	94,426	86,800
Income before income taxes	3,959	4,158
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	74,759	63,351
Income before income taxes	1,298	1,846
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	19,667	23,449
Income before income taxes	2,661	2,312
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
Income before income taxes	$ (2,294)	$ (3,463)