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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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