Business Segment Information - Intra-Segment and Inter-Segment Revenues (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
Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales			(902)	(1,617)
Fluid Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales			(460)	(65)
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	49,709	48,847	149,429	154,606
Energy Solutions Segment [Member] | Fluid Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales			(445)	(12)
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	18,716	26,983	55,736	65,920
Industrial Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales			(902)	(1,617)
Industrial Solutions Segment [Member] | Fluid Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales			(15)	(53)
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	9,000	9,436	27,916	31,930
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(4,170)	(4,723)	(19,532)	(11,298)
Intra - Segment Sales [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(1,071)	(2,134)	(8,861)	(3,998)
Intra - Segment Sales [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(2,914)	(2,227)	(10,038)	(6,204)
Intra - Segment Sales [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(185)	(362)	(633)	(1,096)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	82,147	90,175	254,453	265,871
Operating Segments [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	51,203	51,083	159,181	158,888
Operating Segments [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	21,741	29,269	66,691	73,794
Operating Segments [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales	9,203	9,823	28,581	33,189
Inter-segment Elimination [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(235)	(127)	(478)	(435)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(111)	(59)
Inter-segment Elimination [Member] | Fluid Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(206)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(217)	(102)	(446)	(272)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Fluid Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(206)
Inter-segment Elimination [Member] | Industrial Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(111)	(59)
Inter-segment Elimination [Member] | Fluid Handling Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (18)	$ (25)	$ (32)	$ (163)