Segment Reporting - Reconciliation of Segment Information to Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Operating Income		$ 17,809	$ 77,640	$ 38,866	$ 140,986
Business restructuring		(42)	(81)	(199)	(133)
Other Income (Expense)
Interest, net		(3,865)	(2,727)	(6,687)	(5,033)
Other, net		2,370	(5,369)	4,038	(7,019)
Income before provision for income taxes		16,314	69,544	36,217	128,934
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income		35,234	92,027	74,823	163,620
Operating Segments [Member] | Surfactants [Member]
Segment Reporting Information [Line Items]
Operating Income		15,140	48,249	42,196	102,018
Operating Segments [Member] | Polymers [Member]
Segment Reporting Information [Line Items]
Operating Income		16,321	33,912	26,325	48,041
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Operating Income		3,773	9,866	6,302	13,561
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Unallocated corporate expenses	[1]	$ (17,383)	$ (14,306)	$ (35,758)	$ (22,501)

[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.