Business Restructuring - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Employees	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 72,000	$ 126,000	$ 267,000	$ 708,000
2018 Restructuring [Member] | Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			2,392,000		$ 0
2018 Restructuring [Member] | Germany [Member] | Surfactants [Member] | Decommissioning Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs			79,000
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring			$ 8,884,000
Number positions eliminated | Employees			30
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Decommissioning Costs [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 72,000	$ 126,000	$ 267,000	$ 629,000
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring			1,644,000
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Other Expense [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring			$ 7,240,000