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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |
Goodwill, beginning balance | $ 220,163 | $ 165,861
Goodwill, acquisitions and related adjustments | 4,205 | 55,655
Goodwill, impairment charge | (53,762) |
Goodwill, foreign currency translation | (453) | (1,353)
Goodwill, ending balance | 170,153 | 220,163
Tradename, beginning balance | 26,337 | 19,766
Tradename, acquisitions and related adjustments |  | 10,280
Tradename, impairment charge | (4,161) | (3,340)
Tradename, foreign currency adjustments | (134) | (369)
Tradename, ending balance | 22,042 | 26,337
Energy Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 72,075 | 17,773
Goodwill, acquisitions and related adjustments | 4,205 | 55,655
Goodwill, foreign currency translation | (453) | (1,353)
Goodwill, ending balance | 75,827 | 72,075
Environmental Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 55,031 | 55,031
Goodwill, impairment charge | (6,828) |
Goodwill, ending balance | 48,203 | 55,031
Fluid Handling and Filtration Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 93,057 | 93,057
Goodwill, impairment charge | (46,934) |
Goodwill, ending balance | $ 46,123 | $ 93,057

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