Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net sales	[1]	$ 2,325,768	$ 2,773,270	$ 2,345,966
Operating income		58,613	207,336	170,781
Assets		2,363,354	2,433,172	2,065,612
Depreciation and amortization expenses		105,338	94,650	90,876
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		2,325,768	2,773,270	2,345,966
Operating income		144,645	275,538	253,768
Assets		2,193,849	2,241,161	1,880,106
Capital expenditures		260,622	300,047	189,006
Depreciation and amortization expenses		102,592	92,468	87,809
Surfactants [Member]
Segment Reporting Information [Line Items]
Net sales		1,602,819	1,882,745	1,562,795
Surfactants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		1,602,819	1,882,745	1,562,795
Operating income		72,399	162,746	165,999
Assets		1,586,148	1,579,242	1,245,207
Capital expenditures		231,341	259,442	154,953
Depreciation and amortization expenses		64,377	55,262	51,375
Polymers [Member]
Segment Reporting Information [Line Items]
Net sales		642,471	789,080	713,440
Polymers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		642,471	789,080	713,440
Operating income		60,770	82,897	73,591
Assets		537,193	565,726	556,799
Capital expenditures		19,971	35,679	29,077
Depreciation and amortization expenses		32,426	31,399	30,598
Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales		80,478	101,445	69,731
Specialty Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		80,478	101,445	69,731
Operating income		11,476	29,895	14,178
Assets		70,508	96,193	78,100
Capital expenditures		9,310	4,926	4,976
Depreciation and amortization expenses		$ 5,789	$ 5,807	$ 5,836

[1] Includes net property, plant and equipment, goodwill and other intangible assets.