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Business Segment Information - Net Sales and Operating Income (Loss) by Business Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |
Net sales | $ 197,317 | $ 135,052
Income from operations | 6,972 | 16,683
Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 125,248 | 88,679
Met-Pro [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 30,526 |
Contracting / Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 19,500 | 25,527
Component Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 21,908 | 20,771
Corporate and other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 135 | 75
United States [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 88,170 | 75,824
Netherlands [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 25,588 |
China [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 7,763 | 4,905
Canada [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 3,557 | 7,611
Brazil [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 170 | 121
India [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales |  | 218
Operating Segments [Member] | Engineered Equipment Technology and Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | 18,652 | 15,562
Operating Segments [Member] | Met-Pro [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | 1,383 |
Operating Segments [Member] | Contracting / Services [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | 2,008 | 3,461
Operating Segments [Member] | Component Parts [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | 4,172 | 4,198
Operating Segments [Member] | Corporate and other [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | (17,754) | (6,474)
Inter-segment Elimination [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | $ (1,473) | $ (64)

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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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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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- Details
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