Business Restructuring - Additional Information (Detail)		1 Months Ended	3 Months Ended			12 Months Ended
		Jun. 30, 2017 Employees	Mar. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) Employees	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring costs	[1]					$ 2,744,000	$ 2,588,000	$ 3,069,000
2019 Restructuring [Member] | Netherlands [Member]
Restructuring Cost And Reserve [Line Items]
Severance costs						554,000
2019 Restructuring [Member] | Early Termination of Lease Expenses [Member] | Netherlands [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring						122,000
2018 Restructuring [Member] | Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs						2,313,000
2018 Restructuring [Member] | Germany [Member] | Surfactants [Member] | Asset And Spare Part
Restructuring Cost And Reserve [Line Items]
Restructuring costs							$ 1,404,000
2018 Restructuring [Member] | Decommissioning Costs | Germany [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring costs						909,000
2017 Restructuring [Member] | Fieldsboro, NJ [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring			$ 251,000	$ 915,000
Depreciation expense			$ 1,290,000
2017 Restructuring [Member] | Singapore [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Number positions eliminated | Employees		11
2017 Restructuring [Member] | Termination Benefits [Member] | Singapore [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring					$ 132,000			$ 0
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring						$ 7,484,000
Number positions eliminated | Employees						30
2016 Restructuring [Member] | Termination Benefits [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring						$ 1,644,000
2016 Restructuring [Member] | Other Expense [Member] | Longford Mills [Member] | Surfactants [Member]
Restructuring Cost And Reserve [Line Items]
Business restructuring						$ 5,840,000

[1] See Note 23 regarding business restructuring costs.