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Business Segment Information - Intra-Segment and Inter-Segment Revenues (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
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 37,879 | 44,211 | 73,808 | 83,333
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 37,416 | 52,867 | 78,499 | 100,799
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 18,348 | 15,413 | 34,164 | 32,008
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 227 | (233) | 50 | (707)
Intra - Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (4,178) | (1,950) | (7,994) | (4,598)
Intra - Segment Sales [Member] | Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (800) | (844) | (1,690) | (2,598)
Intra - Segment Sales [Member] | Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (2,839) | (654) | (5,147) | (1,145)
Intra - Segment Sales [Member] | Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (539) | (452) | (1,157) | (855)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 98,133 | 115,307 | 195,786 | 222,953
Operating Segments [Member] | Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 38,718 | 45,522 | 76,266 | 87,575
Operating Segments [Member] | Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 40,255 | 53,740 | 83,668 | 102,321
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 19,160 | 16,045 | 35,852 | 33,057
Inter-segment Elimination [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (258) | (399) | (444) | (571)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (15) | (427) | (838) | (1,467)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (39) | (40) | (39) | (177)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 227 | (233) | 50 | (707)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (427) | (729) | (1,467)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (39) | (40) | (39) | (177)
Inter-segment Elimination [Member] | Energy Segment [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales |  | (219) | (22) | (377)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (258) | (180) | (422) | (194)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (15) |  | (109) |
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 227 | $ (233) | $ 50 | $ (707)

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