Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net sales	[1]	$ 2,773,270	$ 2,345,966	$ 1,869,750
Operating income		207,336	170,781	171,522
Assets		2,433,172	2,065,612	1,752,336
Capital expenditures		301,553	194,482	125,792
Depreciation and amortization expenses		94,650	90,876	81,860
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		2,773,270	2,345,966	1,869,750
Operating income		275,538	253,768	251,281
Assets		2,241,161	1,880,106	1,472,738
Capital expenditures		300,047	189,006	121,163
Depreciation and amortization expenses		92,468	87,809	77,988
Surfactants [Member]
Segment Reporting Information [Line Items]
Net sales		1,882,745	1,562,795	1,351,686
Surfactants [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		1,882,745	1,562,795	1,351,686
Operating income		162,746	165,999	169,101
Assets		1,579,242	1,245,207	1,018,555
Capital expenditures		259,442	154,953	88,484
Depreciation and amortization expenses		55,262	51,375	49,429
Polymers [Member]
Segment Reporting Information [Line Items]
Net sales		789,080	713,440	452,277
Polymers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		789,080	713,440	452,277
Operating income		82,897	73,591	68,214
Assets		565,726	556,799	361,219
Capital expenditures		35,679	29,077	26,719
Depreciation and amortization expenses		31,399	30,598	22,873
Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales		101,445	69,731	65,787
Specialty Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales		101,445	69,731	65,787
Operating income		29,895	14,178	13,966
Assets		96,193	78,100	92,964
Capital expenditures		4,926	4,976	5,960
Depreciation and amortization expenses		$ 5,807	$ 5,836	$ 5,686

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