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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Net sales | $ 103,175 | $ 80,985
Income from operations | 5,807 | 2,979
Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 39,122 | 41,716
Income from operations | 4,746 | 4,018
Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 47,932 | 24,349
Income from operations | 5,196 | 420
Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 16,595 | 15,194
Income from operations | 3,198 | 2,956
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (474) | (274)
Income from operations | (6,920) | (3,817)
Inter-segment Elimination [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from operations | $ (413) | $ (598)

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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 + Details
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