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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 93,870 | $ 112,258 | $ 186,521 | $ 215,433
Income from operations | 9,255 | 8,561 | 10,605 | 14,368
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 37,879 | 44,211 | 73,808 | 83,333
Income from operations | 4,777 | 6,119 | 9,886 | 10,865
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 37,416 | 52,867 | 78,499 | 100,799
Income from operations | 7,528 | 6,367 | 9,141 | 11,563
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 18,348 | 15,413 | 34,164 | 32,008
Income from operations | 4,148 | 3,200 | 7,457 | 6,398
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 227 | (233) | 50 | (707)
Income from operations | (6,769) | (6,618) | (14,780) | (13,537)
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Income from operations | $ (429) | $ (507) | $ (1,099) | $ (921)

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