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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | $ 38,961 | $ 42,916 | $ 85,020 | $ 87,523
Business restructuring |  | (586) | (1,061) | (1,372) | (1,061)
Interest expense, net |  | (2,863) | (3,417) | (5,855) | (7,031)
Other, net |  | 965 | (303) | 2,228 | (828)
Income Before Provision for Income Taxes |  | 37,063 | 39,196 | 81,393 | 79,664
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 57,726 | 60,014 | 118,637 | 121,789
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 31,030 | 27,232 | 69,267 | 64,477
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 21,257 | 30,994 | 42,656 | 53,191
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income |  | 5,439 | 1,788 | 6,714 | 4,121
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Business restructuring |  | (586) | (1,061) | (1,372) | (1,061)
Unallocated corporate expenses | [1] | $ (18,179) | $ (16,037) | $ (32,245) | $ (33,205)
[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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