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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | $ 28,738 | $ 38,794 | $ 116,261 | $ 102,567
Business restructuring |  |  |  | (1,061) |
Interest expense, net |  | (2,824) | (3,837) | (9,855) | (10,760)
Loss from equity in joint ventures (Note 16) |  |  | (863) |  | (3,918)
Other, net |  | 1,229 | (981) | 401 | (94)
Income Before Provision for Income Taxes |  | 27,143 | 33,113 | 106,807 | 87,795
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 50,152 | 46,082 | 171,941 | 146,058
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 20,737 | 21,762 | 85,214 | 79,758
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 27,087 | 24,588 | 80,278 | 62,802
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 2,328 | (268) | 6,449 | 3,498
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unallocated corporate expenses | [1] | $ (21,414) | $ (7,288) | $ (54,619) | $ (43,491)
[1] | 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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