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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
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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

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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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