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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Dec. 31, 2014 USD ($) Employees | Sep. 30, 2014 Employees | Dec. 31, 2013 USD ($) | Sep. 30, 2014 USD ($)
2014 Restructuring [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Number positions eliminated | Employees | 13 |  |  |
Restructuring charges | $ 1,722,000 |  |  |
2013 Restructuring [Member] | Surfactants [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 1,040,000 |
Accelerated depreciation expenses |  |  |  | $ 1,825,000
2013 Restructuring [Member] | North America [Member] | Surfactants [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Number positions eliminated | Employees |  | 16 |  |

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