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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2019 USD ($) Employees | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring | $ 459,000 |  | $ 1,715,000 |  | $ 1,642,000 | $ 2,346,000 |
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 |  |  |  |  | $ 1,968,000 |  |
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 |  |  |  |  | $ 6,885,000 |  |
Decommissioning expense | $ 290,000 |  |  |  |  |  |
Early Termination of Lease Expenses [Member] | Netherlands [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring |  |  |  |  | 122,000 |  |
Termination Benefits [Member] | Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring |  |  |  |  | 1,644,000 |  |
Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | 564,000 |  |
Other Expense [Member] | Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring |  |  |  |  | $ 5,241,000 |  |

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