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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | $ 18,667 | $ 17,809 | $ 38,836 | $ 38,866
Business restructuring |  |  | (42) |  | (199)
Other Income (Expense) |  |  |  |  |
Interest, net |  | (2,661) | (3,865) | (5,732) | (6,687)
Other, net |  | 1,200 | 2,370 | 3,562 | 4,038
Income before provision for income taxes |  | 17,206 | 16,314 | 36,666 | 36,217
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 37,978 | 35,234 | 76,708 | 74,823
Operating Segments [Member] | Surfactants [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 17,062 | 15,140 | 43,142 | 42,196
Operating Segments [Member] | Polymers [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 13,597 | 16,321 | 21,979 | 26,325
Operating Segments [Member] | Specialty Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Income |  | 7,319 | 3,773 | 11,587 | 6,302
Segment Reconciling Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Unallocated corporate expenses | [1] | $ (19,311) | $ (17,383) | $ (37,872) | $ (35,758)
[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 are not used to evaluate segment performance. Unallocated corporate expenses for the three and six months periods ended June 30, 2024 also include a $3,500,000 pre-tax charge related to a criminal social engineering scheme that impacted one of the Company's Asia subsidiaries. See Note 17, Other Matter, below for detailed information about the charge.

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