Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Value of Goodwill (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 103,430,000	$ 100,367,000
Accumulated impairment loss, Beginning Balance	(5,988,000)	(4,445,000)
Goodwill net, Beginning Balance	97,442,000	95,922,000
Goodwill impairment	0	(1,543,000)
Foreign currency translation	(6,074,000)	3,063,000
Goodwill, Ending Balance	97,356,000	103,430,000
Accumulated impairment loss, Ending Balance	(5,988,000)	(5,988,000)
Goodwill net, Ending Balance	91,368,000	97,442,000
Surfactants Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	29,781,000	28,137,000
Accumulated impairment loss, Beginning Balance	(5,505,000)	(4,445,000)
Goodwill net, Beginning Balance	24,276,000	23,692,000
Goodwill impairment	0	(1,060,000)
Foreign currency translation	(3,305,000)	1,644,000
Goodwill, Ending Balance	26,476,000	29,781,000
Accumulated impairment loss, Ending Balance	(5,505,000)	(5,505,000)
Goodwill net, Ending Balance	20,971,000	24,276,000
Polymer Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	73,166,000	71,747,000
Goodwill net, Beginning Balance	73,166,000	71,747,000
Foreign currency translation	(2,769,000)	1,419,000
Goodwill, Ending Balance	70,397,000	73,166,000
Goodwill net, Ending Balance	70,397,000	73,166,000
Specialty Products Segment [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	483,000	483,000
Accumulated impairment loss, Beginning Balance	(483,000)	0
Goodwill net, Beginning Balance	0	483,000
Goodwill impairment		(483,000)
Goodwill, Ending Balance	483,000	483,000
Accumulated impairment loss, Ending Balance	(483,000)	(483,000)
Goodwill net, Ending Balance	$ 0	$ 0