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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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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.

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