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Segment Reporting - Reconciliation of Segment Information to Income Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | $ 44,623 | $ 41,065 | $ 84,627 | $ 70,803
Business restructuring |  | (225) | (450) | (582) | (1,183)
Interest expense, net |  | (1,259) | (1,766) | (2,489) | (3,619)
Other, net |  | 4,437 | 235 | 1,175 | 3,380
Income Before Provision for Income Taxes |  | 47,801 | 39,534 | 83,313 | 70,564
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 67,256 | 60,828 | 114,912 | 113,231
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 48,503 | 32,086 | 84,659 | 69,253
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 15,527 | 22,760 | 23,043 | 34,865
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 3,226 | 5,982 | 7,210 | 9,113
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unallocated corporate expenses | [1] | $ (22,408) | $ (19,313) | $ (29,703) | $ (41,245)
[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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