Business Segments - Business Segment 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
Revenue from External Customer [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)
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	90,872	98,824	300,885	323,610
(Loss) income from continuing operations before income taxes	1,843	1,408	(3,269)	7,590
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	67,452	74,698	231,299	253,874
(Loss) income from continuing operations before income taxes	(437)	(1,557)	(10,640)	(1,382)
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	23,420	24,126	69,586	69,736
(Loss) income from continuing operations before income taxes	2,280	2,965	7,371	8,972
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
(Loss) income from continuing operations before income taxes	$ (2,637)	$ (3,621)	$ (9,010)	$ (9,253)