Business Segments - Business Segment Net Sales and (Loss) Income from Continuing Operations before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue from External Customer [Line Items]
Net sales	$ 107,494	$ 106,415
(Loss) income from continuing operations before income taxes	(11,908)	995
Operating Segments [Member]
Revenue from External Customer [Line Items]
Net sales	107,494	106,415
(Loss) income from continuing operations before income taxes	(7,890)	2,461
Operating Segments [Member] | Forged and Cast Engineered Products [Member]
Revenue from External Customer [Line Items]
Net sales	85,290	85,246
(Loss) income from continuing operations before income taxes	(10,033)	202
Operating Segments [Member] | Air and Liquid Processing [Member]
Revenue from External Customer [Line Items]
Net sales	22,204	21,169
(Loss) income from continuing operations before income taxes	2,143	2,259
Other Expense, Including Corporate Costs - Net [Member]
Revenue from External Customer [Line Items]
(Loss) income from continuing operations before income taxes	$ (4,018)	$ (1,466)