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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 73,543 | $ 84,987 | $ 93,870 | $ 92,651 | $ 99,982 | $ 101,596 | $ 112,258 | $ 103,175 | $ 345,051 | $ 417,011 | $ 367,422
Income (loss) from Operations |  |  |  |  |  |  |  |  | 8,024 | (25,562) | 4,949
Environmental Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 127,279 | 153,344 | 158,371
Income (loss) from Operations |  |  |  |  |  |  |  |  | 13,703 | 15,652 | 17,021
Energy Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 149,514 | 203,376 | 142,150
Income (loss) from Operations |  |  |  |  |  |  |  |  | 8,987 | 23,575 | 3,488
Fluid Handling and Filtration Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 69,159 | 61,783 | 67,610
Income (loss) from Operations |  |  |  |  |  |  |  |  | 14,734 | (36,209) | 11,741
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (901) | (1,492) | (709)
Income (loss) from Operations |  |  |  |  |  |  |  |  | (26,649) | (26,981) | (26,592)
Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Operations |  |  |  |  |  |  |  |  | $ (2,751) | $ (1,599) | $ (709)

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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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