Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Net sales		$ 316,011	$ 341,869	$ 337,339
Income from operations		13,346	17,990	10,002
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income from operations	[1]	(28,044)	(27,133)	(32,833)
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		205,494	210,319	211,185
Income from operations		34,170	33,886	28,797
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		74,697	91,347	80,699
Income from operations		2,183	5,679	6,308
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales		35,820	40,203	45,455
Income from operations		$ 5,037	$ 5,558	$ 7,730

[1] Includes corporate compensation, professional services, information technology, acquisition and integration expenses, and other general, administrative corporate expenses and loss on divestitures.