Revenue - Net Sales and (Loss) Income from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 90,872	$ 98,824	$ 300,885	$ 323,610
(Loss) Income from Continuing Operations Before Income Taxes	(794)	(2,213)	(12,279)	(1,663)
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	63,743	64,983	214,075	207,398
Forged Engineered Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	3,709	9,715	17,224	46,476
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	6,586	7,132	20,397	20,858
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	9,202	9,790	27,272	27,554
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	7,632	7,204	21,917	21,324
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	45,997	50,756	144,895	166,118
(Loss) Income from Continuing Operations Before Income Taxes	(315)	(3,208)	(14,231)	(6,730)
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Net sales	44,875	48,068	155,990	157,492
(Loss) Income from Continuing Operations Before Income Taxes	$ (479)	$ 995	$ 1,952	$ 5,067