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Business Segment Information - Net Sales and Operating Income (Loss) by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 57,170	$ 34,361
Net operating income	5,492	3,338
Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	26,748	20,520
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	15,281	12,023
Fluid Handling Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	15,495	1,645
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	(354)	173
Operating Segments [Member] | Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net operating income	3,866	3,311
Operating Segments [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net operating income	2,387	2,278
Operating Segments [Member] | Fluid Handling Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net operating income	2,671	182
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net operating income	(2,735)	(2,463)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Net operating income	$ (697)	$ 30

X

- Definition

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

+ References

No definition available.

+ Details

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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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