Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales		$ 75,170	$ 81,179	$ 155,656	$ 167,190
Income from operations		4,395	2,018	8,633	6,907
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	[1]	(6,087)	(6,329)	(13,502)	(13,691)
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		49,074	50,572	99,720	105,760
Income from operations		8,646	6,351	17,203	15,642
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		16,664	20,083	37,020	38,936
Income from operations		19	515	1,492	1,117
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		9,432	10,524	18,916	22,494
Income from operations		$ 1,817	$ 1,481	$ 3,440	$ 3,839

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