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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 92,651	$ 103,175
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	35,929	39,122
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	41,083	47,932
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	15,816	16,595
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	(177)	(474)
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(3,816)	(2,648)
Intra - Segment Sales [Member] | Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(890)	(1,754)
Intra - Segment Sales [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(2,308)	(491)
Intra - Segment Sales [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(618)	(403)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	97,653	107,646
Operating Segments [Member] | Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	37,548	42,053
Operating Segments [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	43,413	48,581
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	16,692	17,012
Inter-segment Elimination [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(186)	(172)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(823)	(1,040)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		(137)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(177)	(474)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(729)	(1,040)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales		(137)
Inter-segment Elimination [Member] | Energy Segment [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(22)	(158)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Environmental Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(164)	(14)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	(94)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales	$ (177)	$ (474)

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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