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Business Segment Information - Intra-Segment and Inter-Segment Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Net sales | $ 103,175 | $ 80,985
Intra - Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (2,648) | (2,954)
Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 39,122 | 41,716
Environmental Segment [Member] | Intra - Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (1,754) | (1,807)
Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 47,932 | 24,349
Energy Segment [Member] | Intra - Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (491) | (695)
Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 16,595 | 15,194
Fluid Handling and Filtration Segment [Member] | Intra - Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (403) | (452)
Corporate and Other [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (474) | (274)
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 107,646 | 84,372
Operating Segments [Member] | Environmental Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 42,053 | 43,557
Operating Segments [Member] | Energy Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 48,581 | 25,081
Operating Segments [Member] | Fluid Handling and Filtration Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 17,012 | 15,734
Inter-segment Elimination [Member] | Air Pollution Control Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (172) | (125)
Inter-segment Elimination [Member] | Energy Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (1,040) | (34)
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 | (474) | (274)
Inter-segment Elimination [Member] | Environmental Segment [Member] | Energy Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (1,040) | (34)
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] | Air Pollution Control Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (158) | (37)
Inter-segment Elimination [Member] | Fluid Handling and Filtration Segment [Member] | Air Pollution Control Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | (14) | (88)
Inter-segment Elimination [Member] | Corporate and Other [Member] | Corporate And Other Inter-Segment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | $ (474) | $ (274)

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