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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | $ 28,595 | $ 36,914 | $ 63,773 | $ 59,437
Interest expense, net |  | (2,869) | (3,021) | (6,923) | (5,978)
Loss from equity in joint ventures |  | (1,815) | (1,243) | (3,055) | (2,694)
Other, net |  | 235 | 556 | 887 | 530
Income Before Provision for Income Taxes |  | 24,146 | 33,206 | 54,682 | 51,295
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 49,183 | 41,233 | 99,976 | 74,418
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 24,232 | 19,239 | 57,996 | 37,577
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 23,429 | 18,444 | 38,214 | 29,270
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 1,522 | 3,550 | 3,766 | 7,571
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unallocated corporate expenses | [1] | $ (20,588) | $ (4,319) | $ (36,203) | $ (14,981)
[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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