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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) Employees | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring | $ 450,000 |  | $ 273,000 |  | $ 1,183,000 | $ 631,000 |
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 |  |  |  |  | $ 1,799,000 |  |
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 |  |  |  |  | $ 6,595,000 |  |
Decommissioning expense | 200,000 |  |  |  |  |  |
Termination Benefits [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 | $ 50,000 |  |  |  | 1,644,000 |  |
Decommissioning Costs [Member] | Germany [Member] | Surfactants [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Restructuring costs |  |  |  |  | 395,000 |  |
Other Expense [Member] | Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Business restructuring |  |  |  |  | $ 4,951,000 |  |

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