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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales	$ 86,961	$ 66,641	$ 167,946	$ 123,811
Income from operations	4,488	7,188	7,467	12,680
Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	41,798	32,939	83,514	59,687
Income from operations	5,140	4,876	9,158	8,742
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	27,303	16,835	51,652	32,116
Income from operations	215	1,596	635	3,983
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	17,745	16,650	32,939	32,145
Income from operations	4,431	3,069	7,387	5,740
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	115	217	(159)	(137)
Income from operations	(5,074)	(2,221)	(8,891)	(4,956)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	(3,735)	(4,147)	(6,689)	(6,430)
Income from operations	(224)	(132)	(822)	(829)
Inter-segment Elimination [Member] | Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(1,476)	(2,461)	(3,283)	(3,490)
Inter-segment Elimination [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	(1,560)	(1,284)	(2,255)	(2,193)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	$ (699)	$ (402)	$ (1,151)	$ (747)

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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=26872669&loc=d3e20235-122688

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