Segment Reporting - Reconciliation of Segment Information to Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Operating Income		$ 63,346	$ 53,914
Business restructuring		(52)	(81)
Other Income (Expense)
Interest, net		(2,306)	(1,524)
Other, net		(1,650)	746
Income before provision for income taxes		59,390	53,136
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income		71,593	73,794
Operating Segments [Member] | Surfactants [Member]
Segment Reporting Information [Line Items]
Operating Income		53,769	53,210
Operating Segments [Member] | Polymers [Member]
Segment Reporting Information [Line Items]
Operating Income		14,129	17,951
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Operating Income		3,695	2,633
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated corporate expenses	[1]	$ (8,195)	$ (19,799)

[1] Unallocated corporate expenses primarily comprise 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.