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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Employees | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring costs | $ 72,000 | $ 126,000 | $ 267,000 | $ 708,000 |
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 |  |  | $ 8,884,000 |  |
Number positions eliminated | Employees |  |  | 30 |  |
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Decommissioning Costs [Member] |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Business restructuring | $ 72,000 | $ 126,000 | $ 267,000 | $ 629,000 |
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 |  |  | $ 7,240,000 |  |

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