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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, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 28,585 | $ 28,775
Accumulated impairment loss, Beginning Balance | (3,467) | (3,467)
Goodwill net, Beginning Balance | 25,118 | 25,308
Goodwill measurement period adjustment |  | (120)
Foreign currency translation | (2,164) | (70)
Goodwill, Ending Balance | 26,421 | 28,585
Accumulated impairment loss, Ending Balance | (3,467) | (3,467)
Goodwill net, Ending Balance | 22,954 | 25,118
Surfactants Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 22,627 | 22,958
Accumulated impairment loss, Beginning Balance | (3,467) | (3,467)
Goodwill net, Beginning Balance | 19,160 | 19,491
Goodwill measurement period adjustment |  | (120)
Foreign currency translation | (2,106) | (211)
Goodwill, Ending Balance | 20,521 | 22,627
Accumulated impairment loss, Ending Balance | (3,467) | (3,467)
Goodwill net, Ending Balance | 17,054 | 19,160
Polymer Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 5,475 | 5,334
Goodwill net, Beginning Balance | 5,475 | 5,334
Foreign currency translation | (58) | 141
Goodwill, Ending Balance | 5,417 | 5,475
Goodwill net, Ending Balance | 5,417 | 5,475
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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