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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Goodwill, beginning balance |  | $ 170,153 | $ 220,163
Goodwill, acquisitions and related adjustments |  |  | 4,205
Goodwill, impairment charge |  | (4,443) | (53,762)
Goodwill, foreign currency translation |  | 1,241 | (453)
Goodwill, ending balance | $ 166,951 | 166,951 | 170,153
Tradename, beginning balance |  | 22,042 | 26,337
Tradename, impairment charge |  | (2,725) | (4,161)
Tradename, foreign currency adjustments |  | 374 | (134)
Tradename, ending balance | 19,691 | 19,691 | 22,042
Energy Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance |  | 75,827 | 72,075
Goodwill, acquisitions and related adjustments |  |  | 4,205
Goodwill, impairment charge | (4,400) | (4,443) |
Goodwill, foreign currency translation |  | 1,241 | (453)
Goodwill, ending balance | 72,625 | 72,625 | 75,827
Environmental Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance |  | 48,203 | 55,031
Goodwill, impairment charge |  |  | (6,828)
Goodwill, ending balance | 48,203 | 48,203 | 48,203
Fluid Handling and Filtration Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, beginning balance |  | 46,123 | 93,057
Goodwill, impairment charge |  |  | (46,934)
Goodwill, ending balance | $ 46,123 | $ 46,123 | $ 46,123

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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