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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)

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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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