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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Operating income | [1] | $ 39,655 | $ 46,230
Business restructuring expenses (Note 15) |  | (358) | (786)
Interest expense, net |  | (3,151) | (2,992)
Other, net | [1],[2] | 1,160 | 1,092
Income Before Provision for Income Taxes |  | 37,664 | 44,330
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | [1] | 56,795 | 61,082
Operating Segments [Member] | Surfactants [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | [1] | 40,251 | 38,371
Operating Segments [Member] | Polymers [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | [1] | 16,894 | 21,425
Operating Segments [Member] | Specialty Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating income | [1] | (350) | 1,286
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Unallocated corporate expenses | [1],[3] | $ (16,782) | $ (14,066)
[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.
[2] | The 2017 amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of Accounting Standards Update (ASU) No. 2017-7, Compensation –Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.
[3] | Unallocated corporate expenses primarily comprise corporate administrative expenses (e.g., corporate finance, legal, human resources, information systems, deferred compensation and environmental remediation) that are not included in segment operating income and not used to evaluate segment performance.

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