Business Segments - Business Segment Net Sales and Income before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Net sales	$ 100,290	$ 90,386	$ 192,468	$ 175,103
Income before income taxes	911	2,596	2,576	3,291
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	102,582	92,428	197,008	179,228
Income before income taxes	2,470	3,736	6,429	7,894
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	79,578	71,028	154,337	134,379
Income before income taxes	(129)	1,674	1,169	3,520
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	23,004	21,400	42,671	44,849
Income before income taxes	2,599	2,062	5,260	4,374
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
Income before income taxes	$ (1,559)	$ (1,140)	$ (3,853)	$ (4,603)