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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 28,775 | $ 14,732
Accumulated impairment loss, Beginning Balance | (3,467) | (3,467)
Goodwill net, Beginning Balance | 25,308 | 11,265
Goodwill acquired |  | 14,327
Goodwill measurement period adjustment | (120) |
Foreign currency translation | (70) | (284)
Goodwill, Ending Balance | 28,585 | 28,775
Accumulated impairment loss, Ending Balance | (3,467) | (3,467)
Goodwill net, Ending Balance | 25,118 | 25,308
Surfactants Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 22,958 | 8,869
Accumulated impairment loss, Beginning Balance | (3,467) | (3,467)
Goodwill net, Beginning Balance | 19,491 | 5,402
Goodwill acquired |  | 14,327
Goodwill measurement period adjustment | (120) |
Foreign currency translation | (211) | (238)
Goodwill, Ending Balance | 22,627 | 22,958
Accumulated impairment loss, Ending Balance | (3,467) | (3,467)
Goodwill net, Ending Balance | 19,160 | 19,491
Polymer Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 5,334 | 5,380
Goodwill net, Beginning Balance | 5,334 | 5,380
Foreign currency translation | 141 | (46)
Goodwill, Ending Balance | 5,475 | 5,334
Goodwill net, Ending Balance | 5,475 | 5,334
Specialty Products Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 483 | 483
Goodwill net, Beginning Balance | 483 | 483
Goodwill, Ending Balance | 483 | 483
Goodwill net, Ending Balance | $ 483 | $ 483

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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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