Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 449,987	$ 489,170
Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	327,071	349,650
Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	106,491	120,179
Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	16,425	19,341
North America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	283,281	301,645
North America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	207,946	214,297
North America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	61,841	71,323
North America [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	13,494	16,025
Europe [Member]
Disaggregation Of Revenue [Line Items]
Net sales	99,151	116,899
Europe [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	59,660	71,478
Europe [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	36,560	42,105
Europe [Member] | Specialty Products [Member]
Disaggregation Of Revenue [Line Items]
Net sales	2,931	3,316
Latin America [Member]
Disaggregation Of Revenue [Line Items]
Net sales	47,149	51,009
Latin America [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	46,510	50,812
Latin America [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	639	197
Asia [Member]
Disaggregation Of Revenue [Line Items]
Net sales	20,406	19,617
Asia [Member] | Surfactants [Member]
Disaggregation Of Revenue [Line Items]
Net sales	12,955	13,063
Asia [Member] | Polymers [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 7,451	$ 6,554