Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales		$ 77,425	$ 85,266	$ 233,081	$ 252,456
Income from operations		1,018	4,059	9,651	10,965
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	[1]	(7,797)	(7,186)	(21,299)	(20,878)
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		49,709	48,847	149,429	154,606
Income from operations		7,276	7,633	24,479	23,275
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		18,716	26,983	55,736	65,920
Income from operations		101	2,794	1,593	3,911
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		9,000	9,436	27,916	31,930
Income from operations		$ 1,438	$ 818	$ 4,878	$ 4,657

[1] Includes corporate compensation, professional services, information technology, and other general and administrative corporate expenses