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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 84,987	$ 101,596	$ 271,508	$ 317,029
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	29,735	36,606	103,543	119,939
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	36,182	50,259	114,681	151,058
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	20,105	14,866	54,269	46,874
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	(1,035)	(135)	(985)	(842)
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(2,068)	(2,128)	(10,062)	(6,726)
Intra - Segment Sales [Member] | Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(396)	(941)	(2,086)	(3,539)
Intra - Segment Sales [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(1,102)	(874)	(6,249)	(2,019)
Intra - Segment Sales [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(570)	(313)	(1,727)	(1,168)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	88,196	105,060	283,982	328,013
Operating Segments [Member] | Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	30,138	38,454	106,404	126,029
Operating Segments [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	37,290	51,155	120,958	153,476
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	20,768	15,451	56,620	48,508
Inter-segment Elimination [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(61)	(110)	(505)	(681)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(39)	(1,062)	(877)	(2,529)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(6)	(29)	(45)	(206)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(1,035)	(135)	(985)	(842)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(1)	(878)	(730)	(2,345)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(6)	(29)	(45)	(206)
Inter-segment Elimination [Member] | Energy Segment [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(6)	(22)	(28)	(399)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(55)	(88)	(477)	(282)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(38)	(184)	(147)	(184)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (1,035)	$ (135)	$ (985)	$ (842)

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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