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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | $ 29,553 | $ 26,421
Accumulated impairment loss, Beginning Balance |  | (3,467) | (3,467)
Goodwill net, Beginning Balance |  | 26,086 | 22,954
Goodwill acquired | [1] | 4,225 | 3,497
Goodwill measurement period adjustment |  | (336) |
Foreign currency translation |  | (2,003) | (365)
Goodwill, Ending Balance |  | 31,439 | 29,553
Accumulated impairment loss, Ending Balance |  | (3,467) | (3,467)
Goodwill net, Ending Balance |  | 27,972 | 26,086
Surfactants Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 23,664 | 20,521
Accumulated impairment loss, Beginning Balance |  | (3,467) | (3,467)
Goodwill net, Beginning Balance |  | 20,197 | 17,054
Goodwill acquired | [1] | 4,225 | 3,497
Goodwill measurement period adjustment | [1] | (336) |
Foreign currency translation |  | (2,016) | (354)
Goodwill, Ending Balance |  | 25,537 | 23,664
Accumulated impairment loss, Ending Balance |  | (3,467) | (3,467)
Goodwill net, Ending Balance |  | 22,070 | 20,197
Polymer Segment [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance |  | 5,406 | 5,417
Goodwill net, Beginning Balance |  | 5,406 | 5,417
Foreign currency translation |  | 13 | (11)
Goodwill, Ending Balance |  | 5,419 | 5,406
Goodwill net, Ending Balance |  | 5,419 | 5,406
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
[1] | See Note 20 for information regarding the goodwill acquired in a business combination.

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