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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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net sales	$ 63,300	$ 49,796	$ 187,111	$ 128,590
Net operating income (loss)	5,245	(3,356)	17,925	3,289
Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net sales	27,709	23,441	87,396	68,030
Energy Segment [Member]
Segment Reporting Information [Line Items]
Net sales	17,977	19,243	50,093	50,262
Fluid Handling Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net sales	17,584	6,895	49,729	9,785
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net sales	30	217	(107)	513
Operating Segments [Member] | Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Net operating income (loss)	3,315	2,661	12,057	9,811
Operating Segments [Member] | Energy Segment [Member]
Segment Reporting Information [Line Items]
Net operating income (loss)	1,850	1,885	5,833	6,855
Operating Segments [Member] | Fluid Handling Filtration Segment [Member]
Segment Reporting Information [Line Items]
Net operating income (loss)	4,347	630	10,087	1,071
Operating Segments [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Net operating income (loss)	(3,944)	(7,893)	(8,900)	(13,602)
Inter-segment Elimination [Member]
Segment Reporting Information [Line Items]
Net operating income (loss)	$ (323)	$ (639)	$ (1,152)	$ (846)

X

- Definition

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

+ References

No definition available.

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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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