Business Restructuring - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2020 USD ($) Employees	Mar. 31, 2019 USD ($) Employees	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 357,000	$ 733,000
Netherlands [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees		5
Severance costs		$ 396,000
Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 2,392,000
Germany [Member] | Surfactants [Member] | Asset and Spare Part [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs				$ 1,404,000
Fieldsboro, NJ [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring		251,000	$ 915,000
Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees	30
Business restructuring	$ 7,762,000
Early Termination of Lease Expenses [Member] | Netherlands [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring		79,000
Cumulative Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	988,000
Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs	79,000	187,000
Decommissioning Costs [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	278,000	$ 322,000
Termination Benefits [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	1,644,000
Other Expense [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring	$ 6,118,000