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Business Segment Information - Intra-Segment and Inter-Segment Revenues (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
Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 29,735 | 36,606 | 103,543 | 119,939
Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 36,182 | 50,259 | 114,681 | 151,058
Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 20,105 | 14,866 | 54,269 | 46,874
Corporate and Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1,035) | (135) | (985) | (842)
Intra - Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (2,068) | (2,128) | (10,062) | (6,726)
Intra - Segment Sales [Member] | Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (396) | (941) | (2,086) | (3,539)
Intra - Segment Sales [Member] | Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1,102) | (874) | (6,249) | (2,019)
Intra - Segment Sales [Member] | Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (570) | (313) | (1,727) | (1,168)
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 88,196 | 105,060 | 283,982 | 328,013
Operating Segments [Member] | Environmental Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 30,138 | 38,454 | 106,404 | 126,029
Operating Segments [Member] | Energy Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 37,290 | 51,155 | 120,958 | 153,476
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 20,768 | 15,451 | 56,620 | 48,508
Inter-segment Elimination [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (61) | (110) | (505) | (681)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (39) | (1,062) | (877) | (2,529)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (6) | (29) | (45) | (206)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1,035) | (135) | (985) | (842)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (1) | (878) | (730) | (2,345)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (6) | (29) | (45) | (206)
Inter-segment Elimination [Member] | Energy Segment [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (6) | (22) | (28) | (399)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Environmental Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (55) | (88) | (477) | (282)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Energy Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | (38) | (184) | (147) | (184)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ (1,035) | $ (135) | $ (985) | $ (842)

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