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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 101,246	$ 98,230	$ 86,961	$ 80,985	$ 76,106	$ 63,300	$ 66,641	$ 57,170	$ 367,422	$ 263,217	$ 197,317
Income (loss) from operations									4,949	21,663	6,972
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									158,371	127,707	101,150
Income (loss) from operations									17,021	16,803	15,422
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									142,150	70,285	69,355
Income (loss) from operations									3,488	7,799	9,336
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									67,610	65,638	25,199
Income (loss) from operations									11,741	13,188	1,443
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales									(709)	(413)	1,613
Income (loss) from operations									(26,592)	(14,297)	(17,756)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations									$ (709)	$ (1,830)	$ (1,473)

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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=26872669&loc=d3e20235-122688

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