Revenue and Income Before Income Taxes - Net Sales and Income Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Net sales	$ 94,426	$ 86,800
Income before income taxes	1,665	695
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	60,707	58,166
Forged Engineered Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	14,052	5,185
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	7,300	10,042
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	6,609	7,350
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,758	6,057
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	51,278	44,482
Income before income taxes	1,410	(61)
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Net sales	43,148	42,318
Income before income taxes	$ 255	$ 756