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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, 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
Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(13,897)	(14,898)	(9,194)
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									158,371	127,707	101,150
Environmental Segment [Member] | Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(6,744)	(7,089)	(6,552)
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									142,150	70,285	69,355
Energy Segment [Member] | Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(4,876)	(5,964)	(1,921)
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									67,610	65,638	25,199
Fluid Handling and Filtration Segment [Member] | Intra - Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(2,277)	(1,845)	(721)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales									(709)	(413)	1,613
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									384,992	280,404	208,053
Operating Segments [Member] | Environmental Segment [Member]
Segment Reporting Information [Line Items]
Net sales									167,247	136,544	108,939
Operating Segments [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales									147,661	76,302	71,455
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales									70,084	67,558	26,181
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales											1,478
Inter-segment Elimination [Member] | Air Pollution Control Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(832)	(128)	(440)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(1,937)	(1,403)	(831)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(195)	(345)	(406)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(709)	(413)	135
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(1,937)	(1,403)	(831)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(195)	(345)	(406)
Inter-segment Elimination [Member] | Energy Segment [Member] | Air Pollution Control Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(635)	(53)	(179)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Air Pollution Control Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									(197)	(75)	(261)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member]
Segment Reporting Information [Line Items]
Net sales									$ (709)	$ (413)	$ 135

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=26872669&loc=d3e20235-122688

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