Revenue - Net Sales and (Loss) Income from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 102,519	$ 118,371	$ 210,013	$ 224,786
(Loss) Income from Continuing Operations Before Income Taxes	423	(445)	(11,485)	550
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	73,046	74,927	150,332	142,415
Forged Engineered Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	5,511	19,003	13,515	36,761
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	7,512	7,325	13,811	13,726
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	9,437	9,389	18,070	17,764
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	7,013	7,727	14,285	14,120
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	47,417	61,926	98,898	115,362
(Loss) Income from Continuing Operations Before Income Taxes	(607)	(1,347)	(13,916)	(3,522)
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Net sales	55,102	56,445	111,115	109,424
(Loss) Income from Continuing Operations Before Income Taxes	$ 1,030	$ 902	$ 2,431	$ 4,072