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Business Restructuring - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 Employees | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Employees | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business restructuring |  | $ 273,000 | $ 358,000 | $ 586,000 | [1] | $ 631,000 | $ 1,372,000 | [1] |
Restructuring liability |  | 452,000 | 493,000 |  |  | 452,000 |  |  | $ 691,000
Termination Benefits [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Restructuring liability |  | 363,000 | 449,000 |  |  | 363,000 |  |  | 592,000
Other Expense [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business restructuring |  | 273,000 | 358,000 |  |  |  |  |  |
Restructuring liability |  | 89,000 | $ 44,000 |  |  | 89,000 |  |  | $ 99,000
Longford Mills [Member] | Surfactants [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business restructuring |  |  |  |  |  | $ 5,470,000 |  |  |
Number positions eliminated | Employees |  |  |  |  |  | 30 |  |  |
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 |  |  |  |  |  | 3,876,000 |  |  |
Singapore [Member] | Surfactants [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number positions eliminated | Employees | 11 |  |  |  |  |  |  |  |
Restructuring liability |  | $ 0 |  |  |  | $ 0 |  |  |
Singapore [Member] | Surfactants [Member] | Termination Benefits [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |
Business restructuring |  |  |  | $ 132,000 |  |  | $ 132,000 |  |
[1] | The 2017 data has been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of ASU No. 2017-7, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.

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