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Business Segment Information - Net Sales and Income from Operation by Business Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 112,258 | $ 86,961 | $ 215,433 | $ 167,946
Income from operations | 8,561 | 4,488 | 14,368 | 7,467
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 44,211 | 41,798 | 83,333 | 83,514
Income from operations | 6,119 | 5,140 | 10,865 | 9,158
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 52,867 | 27,303 | 100,799 | 51,652
Income from operations | 6,367 | 215 | 11,563 | 635
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 15,413 | 17,745 | 32,008 | 32,939
Income from operations | 3,200 | 4,431 | 6,398 | 7,387
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (233) | 115 | (707) | (159)
Income from operations | (6,618) | (5,074) | (13,537) | (8,891)
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations | $ (507) | $ (224) | $ (921) | $ (822)

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