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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 84,987 | $ 101,596 | $ 271,508 | $ 317,029
Income from operations | 5,630 | 10,499 | 16,235 | 24,867
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 29,735 | 36,606 | 103,543 | 119,939
Income from operations | 2,157 | 5,459 | 12,043 | 16,324
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 36,182 | 50,259 | 114,681 | 151,058
Income from operations | 5,287 | 8,502 | 14,428 | 20,065
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 20,105 | 14,866 | 54,269 | 46,874
Income from operations | 4,299 | 3,109 | 11,756 | 9,507
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1,035) | (135) | (985) | (842)
Income from operations | (5,404) | (6,520) | (20,184) | (20,058)
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations | $ (709) | $ (51) | $ (1,808) | $ (971)

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