Net Sales and Income (Loss) Before Income Taxes - 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
Disaggregation Of Revenue [Line Items]
Net sales	$ 107,211	$ 102,582	$ 212,014	$ 197,008
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	73,003	66,586	144,702	127,293
FEP [Member]
Disaggregation Of Revenue [Line Items]
Net sales	4,578	12,992	9,677	27,044
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	11,105	7,744	21,740	15,044
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,892	7,067	18,096	13,676
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 9,633	$ 8,193	$ 17,799	$ 13,951