Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Net sales	$ 81,179	$ 81,089	$ 167,190	$ 155,229
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	50,572	51,136	105,760	91,109
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	20,083	19,517	38,936	37,965
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	10,524	10,598	22,494	26,155
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales		(162)
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(3,113)	(3,037)	(6,575)	(6,812)
Intra - Segment Sales [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(973)	(1,929)	(1,864)	(4,398)
Intra - Segment Sales [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(1,800)	(814)	(3,977)	(1,605)
Intra - Segment Sales [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(340)	(294)	(734)	(809)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	85,308	85,401	175,696	164,024
Operating Segments [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	51,656	53,322	107,806	96,450
Operating Segments [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	22,702	20,864	44,524	40,243
Operating Segments [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	10,950	11,215	23,366	27,331
Inter-segment Elimination [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(197)	(575)	(308)	(1,305)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(812)	(533)	(1,558)	(673)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(7)	(167)	(65)	(5)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(111)	(252)	(170)	(938)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		(5)	(12)	(5)
Inter-segment Elimination [Member] | Industrial Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(812)	(533)	(1,558)	(673)
Inter-segment Elimination [Member] | Industrial Solutions Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(7)		(53)
Inter-segment Elimination [Member] | Fluid Handling Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (86)	(323)	$ (138)	$ (367)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		$ (162)