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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | $ 30,309 | $ 28,738 | $ 115,329 | $ 116,261
Business restructuring |  | (426) |  | (1,798) | (1,061)
Interest expense, net |  | (2,763) | (2,824) | (8,618) | (9,855)
Other, net |  | 1,766 | 1,229 | 3,994 | 401
Income Before Provision for Income Taxes |  | 29,312 | 27,143 | 110,705 | 106,807
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 44,570 | 50,152 | 163,207 | 171,941
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 22,466 | 20,737 | 91,733 | 85,214
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 21,116 | 27,087 | 63,772 | 80,278
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 988 | 2,328 | 7,702 | 6,449
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Business restructuring |  | (426) |  | (1,798) | (1,061)
Unallocated corporate expenses | [1] | $ (13,835) | $ (21,414) | $ (46,080) | $ (54,619)
[1] | Unallocated corporate expenses are primarily comprised of 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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