v3.26.1
Segment Reporting - Segment Data and Reconciliations of Segment Data to Consolidated Financial Statements and Non-GAAP Measures (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]          
Net Sales $ 684,109 $ 594,689 $ 1,288,618 $ 1,187,944  
Cost of Sales 584,127 522,804 1,123,785 1,040,596  
Operating Expenses 57,666 53,920 106,700 101,095  
Operating Income 37,210 17,965 (12,412) 46,253  
Unallocated Capital Expenditures [1] (160) 476 (395) 1,069  
Consolidated Capital Expenditures 23,406 25,598 54,294 58,346  
Depreciation and Amortization 30,920 31,289 63,867 60,559  
Assets 2,392,666   2,392,666   $ 2,357,702
Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net Sales 684,109 594,689 1,288,618 1,187,944  
Cost of Sales [2] 583,716 523,077 1,122,951 1,041,036  
Operating Expenses [3] 38,555 35,828 71,744 68,668  
Operating Income 61,838 35,784 93,923 78,240  
Segment Capital Expenditures 23,566 25,122 54,689 57,277  
Depreciation and Amortization 30,685 30,961 63,282 59,941  
Assets 2,280,823   2,280,823   2,249,599
Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Unallocated Corporate Expenses [4] (24,628) (17,819) (106,335) (31,987)  
Unallocated Depreciation and Amortization [5] 235 328 585 618  
Unallocated Assets [6] 111,843   111,843   108,103
Surfactants [Member]          
Segment Reporting Information [Line Items]          
Net Sales 483,902 411,456 937,589 841,793  
Unallocated Capital Expenditures [1] 0   0    
Surfactants [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net Sales 483,902 411,456 937,589 841,793  
Cost of Sales [2] 420,295 370,660 830,312 747,326  
Operating Expenses [3] 29,245 27,429 54,367 52,170  
Operating Income 34,362 13,367 52,910 42,297  
Segment Capital Expenditures 16,057 19,675 38,440 43,679  
Depreciation and Amortization 20,520 21,137 43,088 40,567  
Assets 1,650,031   1,650,031   1,630,551
Unallocated Assets 0   0    
Surfactants [Member] | Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Unallocated Corporate Expenses [4] 0   0    
Unallocated Depreciation and Amortization [5] 0   0    
Polymers [Member]          
Segment Reporting Information [Line Items]          
Net Sales 178,007 162,751 308,036 308,867  
Unallocated Capital Expenditures [1] 0   0    
Polymers [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net Sales 178,007 162,751 308,036 308,867  
Cost of Sales [2] 147,228 138,124 261,273 269,020  
Operating Expenses [3] 8,310 7,468 15,472 14,670  
Operating Income 22,469 17,159 31,291 25,177  
Segment Capital Expenditures 6,517 4,581 13,795 11,652  
Depreciation and Amortization 8,698 8,352 17,274 16,413  
Assets 545,676   545,676   536,748
Unallocated Assets 0   0    
Polymers [Member] | Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Unallocated Corporate Expenses [4] 0   0    
Unallocated Depreciation and Amortization [5] 0   0    
Specialty Products [Member]          
Segment Reporting Information [Line Items]          
Net Sales 22,200 20,482 42,993 37,284  
Unallocated Capital Expenditures [1] 0   0    
Specialty Products [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Net Sales 22,200 20,482 42,993 37,284  
Cost of Sales [2] 16,193 14,293 31,366 24,690  
Operating Expenses [3] 1,000 931 1,905 1,828  
Operating Income 5,007 5,258 9,722 10,766  
Segment Capital Expenditures 992 866 2,454 1,946  
Depreciation and Amortization 1,467 $ 1,472 2,920 $ 2,961  
Assets 85,116   85,116   $ 82,300
Unallocated Assets 0   0    
Specialty Products [Member] | Segment Reconciling Items [Member]          
Segment Reporting Information [Line Items]          
Unallocated Corporate Expenses [4] 0        
Unallocated Depreciation and Amortization [5] $ 0   $ 0    
[1] Unallocated capital expenditures primarily include capital expenditures related to the Company’s Northfield, Illinois location.
[2] 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.
[3] 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.
[4] 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 expenses that are not included in segment operating income and not used to evaluate segment performance.
[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.