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Business Segment Information - Net Sales and Income from Operation by Business Segment (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
Income from operations	5,630	10,499	16,235	24,867
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales	29,735	36,606	103,543	119,939
Income from operations	2,157	5,459	12,043	16,324
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	36,182	50,259	114,681	151,058
Income from operations	5,287	8,502	14,428	20,065
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	20,105	14,866	54,269	46,874
Income from operations	4,299	3,109	11,756	9,507
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	(1,035)	(135)	(985)	(842)
Income from operations	(5,404)	(6,520)	(20,184)	(20,058)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income from operations	$ (709)	$ (51)	$ (1,808)	$ (971)

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- 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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