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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Net sales	$ 102,218	$ 99,647	$ 314,232	$ 296,655
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	68,325	66,653	213,027	193,946
FEP [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,300	8,858	14,977	35,902
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	10,068	8,532	31,808	22,483
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	9,357	8,457	27,453	22,133
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 9,168	$ 7,147	$ 26,967	$ 22,191