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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 101,246 | $ 98,230 | $ 86,961 | $ 80,985 | $ 76,106 | $ 63,300 | $ 66,641 | $ 57,170 | $ 367,422 | $ 263,217 | $ 197,317
Income (loss) from operations |  |  |  |  |  |  |  |  | 4,949 | 21,663 | 6,972
Environmental Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 158,371 | 127,707 | 101,150
Income (loss) from operations |  |  |  |  |  |  |  |  | 17,021 | 16,803 | 15,422
Energy Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 142,150 | 70,285 | 69,355
Income (loss) from operations |  |  |  |  |  |  |  |  | 3,488 | 7,799 | 9,336
Fluid Handling and Filtration Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 67,610 | 65,638 | 25,199
Income (loss) from operations |  |  |  |  |  |  |  |  | 11,741 | 13,188 | 1,443
Corporate and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | (709) | (413) | 1,613
Income (loss) from operations |  |  |  |  |  |  |  |  | (26,592) | (14,297) | (17,756)
Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | $ (709) | $ (1,830) | $ (1,473)

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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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