Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 100,367,000	$ 100,654,000
Accumulated impairment loss, Beginning Balance		(4,445,000)	(3,467,000)
Goodwill net, Beginning Balance		95,922,000	97,187,000
Goodwill acquired	[1]		1,792,000
Goodwill impairment		(1,543,000)	(978,000)
Foreign currency translation		3,063,000	(2,079,000)
Goodwill, Ending Balance		103,430,000	100,367,000
Accumulated impairment loss, Ending Balance		(5,988,000)	(4,445,000)
Goodwill net, Ending Balance		97,442,000	95,922,000
Surfactants Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		28,137,000	25,689,000
Accumulated impairment loss, Beginning Balance		(4,445,000)	(3,467,000)
Goodwill net, Beginning Balance		23,692,000	22,222,000
Goodwill acquired	[1]		1,792,000
Goodwill impairment		(1,060,000)	(978,000)
Foreign currency translation		1,644,000	656,000
Goodwill, Ending Balance		29,781,000	28,137,000
Accumulated impairment loss, Ending Balance		(5,505,000)	(4,445,000)
Goodwill net, Ending Balance		24,276,000	23,692,000
Polymer Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		71,747,000	74,482,000
Goodwill net, Beginning Balance		71,747,000	74,482,000
Foreign currency translation		1,419,000	(2,735,000)
Goodwill, Ending Balance		73,166,000	71,747,000
Goodwill net, Ending Balance		73,166,000	71,747,000
Specialty Products Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance		483,000	483,000
Goodwill net, Beginning Balance		483,000	483,000
Goodwill impairment		(483,000)
Goodwill, Ending Balance		483,000	483,000
Accumulated impairment loss, Ending Balance		$ (483,000)
Goodwill net, Ending Balance			$ 483,000

[1] See Note 20, Acquisitions, of the notes to the Company’s consolidated financial statements (included in Item 8 of this Form 10-K) for information regarding the goodwill acquired in a business combination.