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Acquisitions - Summary of Purchase Price Allocation for Acquisition (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 17, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets: |  |  |  |
Goodwill | $ 27,972 |  | $ 26,086 | $ 22,954
Surfactants [Member] |  |  |  |
Assets: |  |  |  |
Goodwill | $ 22,070 |  | $ 20,197 | $ 17,054
2020 Acquisitions [Member] | Clariant (Mexico) [Member] | Surfactants [Member] |  |  |  |
Assets: |  |  |  |
Goodwill |  | $ 4,225 |  |
Property, plant and equipment |  | 175 |  |
Total assets acquired |  | 14,000 |  |
2020 Acquisitions [Member] | Clariant (Mexico) [Member] | Surfactants [Member] | Customer Lists [Member} |  |  |  |
Assets: |  |  |  |
Identifiable intangible assets |  | 8,000 |  |
2020 Acquisitions [Member] | Clariant (Mexico) [Member] | Surfactants [Member] | Trademarks and Know-how [Member] |  |  |  |
Assets: |  |  |  |
Identifiable intangible assets |  | 1,300 |  |
2020 Acquisitions [Member] | Clariant (Mexico) [Member] | Surfactants [Member] | Non-compete Agreements [Member] |  |  |  |
Assets: |  |  |  |
Identifiable intangible assets |  | $ 300 |  |

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