Net Sales and Income (Loss) Before Income Taxes - Net Sales and Income 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
Disaggregation Of Revenue [Line Items]
Net sales	$ 99,647	$ 81,185	$ 296,655	$ 260,413
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	66,653	53,778	193,946	177,918
FEP [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,858	7,401	35,902	17,640
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,532	6,527	22,483	18,482
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,457	6,383	22,133	21,235
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 7,147	$ 7,096	$ 22,191	$ 25,138