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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 9 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Sep. 30, 2016 USD ($) Employees
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  |  |  |  | $ 1,061,000
Ethoxylation Assets [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Depreciation expense |  |  |  | $ 1,084,000 |  |
Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Number positions eliminated | Employees |  |  |  |  |  | 30
Depreciation expense |  | $ 1,295,000 |  |  |  | $ 3,222,000
Longford Mills [Member] | Surfactants [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Depreciation expense | $ 1,300,000 |  |  |  |  |
Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Business restructuring |  |  | $ 1,061,000 |  | $ 1,061,000 |
Longford Mills [Member] | Surfactants [Member] | Plant Consolidation Expenses [Member] |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |
Expected amount of restructuring expenses |  | $ 3,000,000 |  |  |  | $ 3,000,000

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