Revenue - Net Sales and (Loss) Income from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 107,494	$ 106,415
(Loss) Income from Continuing Operations Before Income Taxes	(11,908)	995
Forged and Cast Mill Rolls [Member]
Disaggregation Of Revenue [Line Items]
Net sales	77,286	67,488
Forged Engineered Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,004	17,758
Heat Exchange Coils [Member]
Disaggregation Of Revenue [Line Items]
Net sales	6,299	6,401
Centrifugal Pumps [Member]
Disaggregation Of Revenue [Line Items]
Net sales	8,633	8,375
Air Handling Systems [Member]
Disaggregation Of Revenue [Line Items]
Net sales	7,272	6,393
U.S. [Member]
Disaggregation Of Revenue [Line Items]
Net sales	51,481	53,436
(Loss) Income from Continuing Operations Before Income Taxes	(13,309)	(2,175)
Foreign [Member]
Disaggregation Of Revenue [Line Items]
Net sales	56,013	52,979
(Loss) Income from Continuing Operations Before Income Taxes	$ 1,401	$ 3,170