Business Segments - Business Segment 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
Revenue from External Customer [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
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	102,519	118,371	210,013	224,786
(Loss) income from continuing operations before income taxes	2,778	3,721	(5,112)	6,182
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	78,557	93,930	163,847	179,176
(Loss) income from continuing operations before income taxes	(170)	(27)	(10,203)	175
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	23,962	24,441	46,166	45,610
(Loss) income from continuing operations before income taxes	2,948	3,748	5,091	6,007
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
(Loss) income from continuing operations before income taxes	$ (2,355)	$ (4,166)	$ (6,373)	$ (5,632)