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Business Restructuring and Asset Impairments - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jun. 30, 2017 Employees | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Employees | Dec. 31, 2016 USD ($)
2017 Restructuring [Member] | Fieldsboro, NJ [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  | $ 915,000 |  |  |  |
Depreciation expense |  | $ 1,290,000 |  |  |  |
2017 Restructuring [Member] | Singapore [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Number positions eliminated | Employees | 11 |  |  |  |  |
2017 Restructuring [Member] | Singapore [Member] | Surfactants [Member] | Termination Benefits [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  | $ 132,000 |  | $ 0 |
2016 Restructuring [Member] | Longford Mills [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  | 2,022,000 | $ 2,817,000
2016 Restructuring [Member] | Longford Mills [Member] | Termination Benefits [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  |  | 1,594,000
2016 Restructuring [Member] | Longford Mills [Member] | Other Expense [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  | 2,022,000 | 1,223,000
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  | 4,839,000 |
Depreciation expense |  |  |  |  | $ 0 | 4,471,000
Number positions eliminated | Employees |  |  |  |  | 30 |
Decommissioning expense |  |  |  |  | $ 2,022,000 |
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  | 1,594,000 |
2016 Restructuring [Member] | Longford Mills [Member] | Surfactants [Member] | Other Expense [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  | $ 3,245,000 |
2016 Asset Impairments [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 4,247,000 |  |
2016 Asset Impairments [Member] | United States [Member] | Nonionic Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | 2,297,000 |  |
2016 Asset Impairments [Member] | Brazil [Member] | Bahia Plant |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 1,950,000 |  |
2016 Asset Impairments [Member] | Brazil [Member] | Bahia Plant | Take-Or-Pay Contract [Member] | Net Sales [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Compensation for lost future revenues |  |  |  |  |  | $ 4,250,000

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