Segment Reporting - Operating Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 751,633	$ 595,511	$ 1,426,909	$ 1,133,251
Surfactants [Member]
Segment Reporting Information [Line Items]
Net sales	485,084	384,002	953,350	754,938
Polymers [Member]
Segment Reporting Information [Line Items]
Net sales	238,885	190,538	425,964	340,923
Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	$ 27,664	$ 20,971	$ 47,595	$ 37,390