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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.