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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 93,854	$ 88,256	$ 81,089	$ 74,139	$ 73,543	$ 84,987	$ 93,870	$ 92,651	$ 337,339	$ 345,051	$ 417,011
Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									211,185	188,955	254,806
Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									75,414	87,838	101,909
Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									50,740	69,159	61,788
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales										(901)	(1,492)
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(12,479)	(15,237)	(9,476)
Intra - Segment Sales [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(7,912)	(8,833)	(3,506)
Intra - Segment Sales [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(3,084)	(3,235)	(4,256)
Intra - Segment Sales [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									(1,483)	(3,169)	(1,714)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									352,319	363,464	432,566
Operating Segments [Member] | Energy Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									220,334	197,897	258,710
Operating Segments [Member] | Industrial Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									79,139	91,915	109,524
Operating Segments [Member] | Fluid Handling Solutions Segment [Member]
Segment Reporting Information [Line Items]
Net sales									52,846	73,652	64,332
Inter-segment Elimination [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(1,848)	(601)	(715)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(607)	(1,619)	(3,666)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(46)	(55)	(206)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales										(901)	(1,492)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(1,232)	(109)	(398)
Inter-segment Elimination [Member] | Energy Solutions Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(5)
Inter-segment Elimination [Member] | Industrial Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(600)	(787)	(3,153)
Inter-segment Elimination [Member] | Industrial Solutions Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(41)	(55)	(206)
Inter-segment Elimination [Member] | Fluid Handling Solutions Segment [Member] | Industrial Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(616)	(492)	(317)
Inter-segment Elimination [Member] | Fluid Handling Solutions Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									$ (7)	(832)	(513)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales										$ (901)	$ (1,492)

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