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Segment Reporting - Segment Data and Reconciliations of Segment Data to Consolidated Financial Statements and Non-GAAP Measures (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | $ 590,284 | $ 546,842 | $ 1,778,228 | $ 1,654,665 |
Cost of Sales |  | 519,261 | 471,157 | 1,559,857 | 1,439,147 |
Operating Expenses |  | 49,229 | 51,736 | 150,324 | 152,733 |
Operating Income |  | 21,794 | 23,949 | 68,047 | 62,785 |
Consolidated Capital Expenditures |  | 29,550 | 26,705 | 87,896 | 86,572 |
Depreciation and Amortization |  | 32,746 | 28,062 | 93,305 | 83,676 |
Assets |  | 2,432,284 |  | 2,432,284 |  | $ 2,304,648
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 590,284 | 546,842 | 1,778,228 | 1,654,665 |
Cost of Sales | [1] | 519,013 | 471,162 | 1,560,049 | 1,438,787 |
Operating Expenses | [2] | 31,815 | 30,402 | 100,483 | 93,892 |
Operating Income |  | 39,456 | 45,278 | 117,696 | 121,986 |
Segment Capital Expenditures |  | 29,055 | 26,705 | 86,332 | 86,572 |
Depreciation and Amortization |  | 32,037 | 27,586 | 91,978 | 82,324 |
Assets |  | 2,302,723 |  | 2,302,723 |  | 2,172,779
Segment Reconciling Items [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Unallocated Corporate Expenses | [3] | (17,662) | (21,329) | (49,649) | (59,201) |
Unallocated Capital Expenditures | [4] | 495 | 0 | 1,564 | 0 |
Unallocated Depreciation and Amortization | [5] | 709 | 476 | 1,327 | 1,352 |
Unallocated Assets | [6] | 129,561 |  | 129,561 |  | 131,869
Surfactants [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 422,358 | 382,724 | 1,264,151 | 1,153,339 |
Surfactants [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 422,358 | 382,724 | 1,264,151 | 1,153,339 |
Cost of Sales | [1] | 382,447 | 333,280 | 1,129,773 | 1,012,566 |
Operating Expenses | [2] | 24,193 | 23,141 | 76,363 | 71,328 |
Operating Income |  | 15,718 | 26,303 | 58,015 | 69,445 |
Segment Capital Expenditures |  | 21,752 | 22,269 | 65,431 | 74,890 |
Depreciation and Amortization |  | 22,306 | 17,926 | 62,873 | 53,455 |
Assets |  | 1,664,552 |  | 1,664,552 |  | 1,578,689
Polymers [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 143,928 | 149,796 | 452,795 | 455,061 |
Polymers [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 143,928 | 149,796 | 452,795 | 455,061 |
Cost of Sales | [1] | 123,025 | 128,038 | 392,045 | 397,581 |
Operating Expenses | [2] | 6,799 | 6,510 | 21,469 | 20,253 |
Operating Income |  | 14,104 | 15,248 | 39,281 | 37,227 |
Segment Capital Expenditures |  | 6,401 | 3,524 | 18,053 | 8,645 |
Depreciation and Amortization |  | 8,270 | 8,180 | 24,683 | 24,415 |
Assets |  | 560,983 |  | 560,983 |  | 523,192
Specialty Products [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 23,998 | 14,322 | 61,282 | 46,265 |
Specialty Products [Member] | Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net Sales |  | 23,998 | 14,322 | 61,282 | 46,265 |
Cost of Sales | [1] | 13,541 | 9,844 | 38,231 | 28,640 |
Operating Expenses | [2] | 823 | 751 | 2,651 | 2,311 |
Operating Income |  | 9,634 | 3,727 | 20,400 | 15,314 |
Segment Capital Expenditures |  | 902 | 912 | 2,848 | 3,037 |
Depreciation and Amortization |  | 1,461 | $ 1,480 | 4,422 | $ 4,454 |
Assets |  | $ 77,188 |  | $ 77,188 |  | $ 70,898
[1] | Cost of sales is comprised of raw material costs (including freight and shipping/handling expenses to deliver the raw materials), manufacturing plant labor expenses and other manufacturing overhead expenses, such as utilities, maintenance, depreciation, etc., that can be allocated to reportable segments.
[2] | Operating expenses allocated to reportable segments are comprised of selling, administrative and research and development expenses. The CODM uses operating expenses in aggregate to analyze the performance of each reportable segment.
[3] | Unallocated corporate expenses are primarily comprised of corporate administrative expenses (e.g., corporate finance, legal, human resources, information technology and environmental remediation expenses), deferred compensation and business restructuring and assets impairment expenses that are not included in segment operating income and not used to evaluate segment performance.
[4] | Unallocated capital expenditures primarily include capital expenditures related to the Company’s Northfield, Illinois location.
[5] | Unallocated depreciation and amortization primarily includes depreciation related to the Company’s Northfield, Illinois location.
[6] | Unallocated assets primarily include assets in the Company’s Northfield, Illinois location.

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