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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 66,641 | $ 44,433 | $ 123,811 | $ 78,794
Net operating income | 7,188 | 3,307 | 12,680 | 6,645
Air Pollution Control Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 32,939 | 24,069 | 59,687 | 44,589
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 16,835 | 18,996 | 32,116 | 31,019
Fluid Handling Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 16,650 | 1,245 | 32,145 | 2,890
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 217 | 123 | (137) | 296
Operating Segments [Member] | Air Pollution Control Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net operating income | 4,876 | 3,839 | 8,742 | 7,150
Operating Segments [Member] | Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net operating income | 1,596 | 3,135 | 3,983 | 5,413
Operating Segments [Member] | Fluid Handling Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net operating income | 3,069 | 259 | 5,740 | 441
Operating Segments [Member] | Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net operating income | (2,221) | (3,689) | (4,956) | (6,152)
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net operating income | $ (132) | $ (237) | $ (829) | $ (207)

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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