Business Segments - Business Segment Net Sales and Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from External Customer [Line Items]
Net sales	$ 106,908	$ 100,290	$ 209,291	$ 192,468
Income before income taxes	1,148	3,315	2,446	3,284
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	107,211	102,582	212,014	197,008
Income before income taxes	6,881	4,874	12,058	7,137
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	77,581	79,578	154,379	154,337
Income before income taxes	3,904	2,275	6,128	1,877
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	29,630	23,004	57,635	42,671
Income before income taxes	2,977	2,599	5,930	5,260
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
Income before income taxes	$ (5,733)	$ (1,559)	$ (9,612)	$ (3,853)