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Business Restructuring - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 14 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) Employees | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Employees
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  | $ 586,000 | $ 1,061,000 | $ 1,372,000 | $ 1,061,000 |
Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  |  | $ 4,057,000
Number positions eliminated | Employees |  |  |  |  |  | 30
Expected restructuring expenses | $ 4,500,000 | 4,500,000 |  | 4,500,000 |  | $ 4,500,000
Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  |  | 1,594,000
Longford Mills [Member] | Surfactants [Member] | Other Expense [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  |  | $ 2,463,000
Singapore Plant [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Number positions eliminated | Employees | 11 |  |  |  |  |
Singapore Plant [Member] | Surfactants [Member] | Termination Expense [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  | $ 132,000 |  | $ 132,000 |  |

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