Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 602,688	$ 464,480	$ 1,735,939	$ 1,375,016
Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	387,734	333,839	1,142,672	993,245
Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	198,841	116,682	539,764	335,582
Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	16,113	13,959	53,503	46,189
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	335,449	282,816	976,253	855,777
North America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	217,481	202,121	660,061	617,638
North America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	104,055	68,635	270,524	199,256
North America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	13,913	12,060	45,668	38,883
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales	158,057	96,704	450,161	286,835
Europe [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	73,199	56,468	209,632	171,940
Europe [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	82,872	38,337	233,625	107,589
Europe [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,986	1,899	6,904	7,306
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	82,473	61,116	225,303	164,922
Latin America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	81,164	60,393	221,301	163,097
Latin America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,095	723	3,071	1,825
Latin America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	214		931
Asia [Member]
Disaggregation Of Revenue [Line Items]
Net sales	26,709	23,844	84,222	67,482
Asia [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	15,890	14,857	51,678	40,570
Asia [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 10,819	$ 8,987	$ 32,544	$ 26,912