Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Disaggregation Of Revenue [Line Items]
Net sales	[1]	$ 2,332,114	$ 2,180,274	$ 2,325,768
Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales		1,665,983	1,532,115	1,602,819
Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales		584,477	584,905	642,471
Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales		81,654	63,254	80,478
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales		1,337,071	1,239,605	1,354,999
North America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales		954,055	894,105	949,218
North America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales		314,474	289,777	338,979
North America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales		68,542	55,723	66,802
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales		542,821	517,525	561,915
Europe [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales		306,994	263,841	289,010
Europe [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales		223,317	246,529	259,491
Europe [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales		12,510	7,155	13,414
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Net sales		358,497	321,093	306,244
Latin America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales		357,053	319,438	304,870
Latin America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales		842	1,279	1,112
Latin America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales		602	376	262
Asia [Member]
Disaggregation Of Revenue [Line Items]
Net sales		93,725	102,051	102,610
Asia [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales		47,881	54,731	59,721
Asia [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales		$ 45,844	$ 47,320	$ 42,889

[1] Net sales are attributed to countries based on the location of the Company legal entity making the sale.