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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |
Net sales | $ 92,651 | $ 103,175
Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 35,929 | 39,122
Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 41,083 | 47,932
Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 15,816 | 16,595
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (177) | (474)
Intra - Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (3,816) | (2,648)
Intra - Segment Sales [Member] | Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (890) | (1,754)
Intra - Segment Sales [Member] | Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (2,308) | (491)
Intra - Segment Sales [Member] | Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (618) | (403)
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 97,653 | 107,646
Operating Segments [Member] | Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 37,548 | 42,053
Operating Segments [Member] | Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 43,413 | 48,581
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 16,692 | 17,012
Inter-segment Elimination [Member] | Environmental Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (186) | (172)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (823) | (1,040)
Inter-segment Elimination [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales |  | (137)
Inter-segment Elimination [Member] | Corporate And Other Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (177) | (474)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (729) | (1,040)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Fluid Handling Filtration Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales |  | (137)
Inter-segment Elimination [Member] | Energy Segment [Member] | Environmental Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (22) | (158)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Environmental Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (164) | (14)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Energy Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (94) |
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | $ (177) | $ (474)

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