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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.

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