Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 86,011	$ 74,139
Income from operations	4,890	12,150
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	55,188	39,973
Income from operations	9,291	3,624
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	18,853	18,448
Income from operations	602	1,198
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	11,970	15,556
Income from operations	2,358	3,381
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales		162
Income from operations	$ (7,361)	4,533
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income from operations		$ (586)