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Business Restructuring - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Employees
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Restructuring Cost And Reserve [Line Items]          
Restructuring costs [1]     $ 1,212,000 $ 2,744,000 $ 2,588,000
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     2,392,000    
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] | Cumulative Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring costs     988,000    
2018 Restructuring [Member] | Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member]          
Restructuring Cost And Reserve [Line Items]          
Restructuring costs     79,000 909,000  
2017 Restructuring [Member] | Fieldsboro, NJ [Member]          
Restructuring Cost And Reserve [Line Items]          
Business restructuring $ 915,000 $ 251,000      
Depreciation expense   $ 1,290,000      
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member]          
Restructuring Cost And Reserve [Line Items]          
Business restructuring     $ 8,617,000    
Number positions eliminated | Employees     30    
2016 Restructuring [Member] | Decommissioning Costs [Member] | Longford Mills [Member] | Surfactants [Member]          
Restructuring Cost And Reserve [Line Items]          
Business restructuring     $ 1,133,000 $ 1,410,000 $ 1,185,000
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     $ 6,973,000    
[1] See Note 22 regarding business restructuring costs.