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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation Of Revenue [Line Items]
Net sales	$ 590,284	$ 546,842	$ 1,778,228	$ 1,654,665
Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	422,358	382,724	1,264,151	1,153,339
Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	143,928	149,796	452,795	455,061
Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	23,998	14,322	61,282	46,265
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	332,817	303,880	1,010,257	932,268
North America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	233,333	217,809	719,432	667,919
North America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	78,795	73,999	239,839	223,636
North America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	20,689	12,072	50,986	40,713
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales	131,307	132,138	418,729	400,811
Europe [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	74,382	66,387	230,585	200,625
Europe [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	53,830	63,632	178,268	194,910
Europe [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	3,095	2,119	9,876	5,276
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	98,858	85,086	272,855	247,411
Latin America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	98,444	84,609	271,735	246,046
Latin America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	200	346	700	1,089
Latin America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	214	131	420	276
Asia [Member]
Disaggregation Of Revenue [Line Items]
Net sales	27,302	25,738	76,387	74,175
Asia [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	16,199	13,919	42,399	38,749
Asia [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 11,103	$ 11,819	$ 33,988	$ 35,426

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