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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 101,596 | $ 98,230 | $ 317,029 | $ 266,176
Income (loss) from operations | 10,499 | (2,194) | 24,867 | 5,273
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 36,606 | 40,644 | 119,939 | 124,158
Income (loss) from operations | 5,459 | 5,225 | 16,324 | 14,383
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 50,259 | 40,014 | 151,058 | 91,666
Income (loss) from operations | 8,502 | (1,082) | 20,065 | (447)
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 14,866 | 17,136 | 46,874 | 50,075
Income (loss) from operations | 3,109 | 4,011 | 9,507 | 11,398
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (135) | 436 | (842) | 277
Income (loss) from operations | (6,520) | (11,170) | (20,058) | $ (20,061)
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income (loss) from operations | $ (51) | $ 822 | $ (971) |

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