Business Restructuring - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Employees	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 81,000	$ 357,000
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	$ 8,698,000
Number positions eliminated | Employees	30
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Decommissioning Costs [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 81,000	$ 278,000
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	$ 7,054,000