Segment Reporting - Reconciliation of Segment Information to Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Operating Income		$ 21,057	$ 63,346
Business restructuring		(157)	(52)
Other Income (Expense)
Interest, net		(2,822)	(2,306)
Other, net		1,668	(1,650)
Income before provision for income taxes		19,903	59,390
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income		39,590	71,593
Operating Segments [Member] | Surfactants [Member]
Segment Reporting Information [Line Items]
Operating Income		27,056	53,769
Operating Segments [Member] | Polymers [Member]
Segment Reporting Information [Line Items]
Operating Income		10,004	14,129
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Operating Income		2,530	3,695
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated corporate expenses	[1]	$ (18,376)	$ (8,195)

[1] Unallocated corporate expenses are primarily comprised of corporate administrative expenses (e.g., corporate finance, legal, human resources, information systems, deferred compensation and environmental remediation) that are not included in segment operating income and are not used to evaluate segment performance.