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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, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Net sales | $ 92,651 | $ 103,175
Income from Operations | 1,350 | 5,807
Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 35,929 | 39,122
Income from Operations | 5,109 | 4,746
Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 41,083 | 47,932
Income from Operations | 1,613 | 5,196
Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 15,816 | 16,595
Income from Operations | 3,309 | 3,198
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (177) | (474)
Income from Operations | (8,011) | (6,920)
Inter-segment Elimination [Member] |  |
Segment Reporting Information [Line Items] |  |
Income from Operations | $ (670) | $ (413)

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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=63488584&loc=d3e20235-122688 + Details
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