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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disaggregation Of Revenue [Line Items]        
Net sales $ 684,109 $ 594,689 $ 1,288,618 $ 1,187,944
Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 483,902 411,456 937,589 841,793
Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 178,007 162,751 308,036 308,867
Specialty Products [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 22,200 20,482 42,993 37,284
North America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 392,759 339,448 741,767 677,440
North America [Member] | Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 273,715 234,364 532,810 486,099
North America [Member] | Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 99,245 88,251 171,047 161,044
North America [Member] | Specialty Products [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 19,799 16,833 37,910 30,297
Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 151,598 141,415 295,928 287,422
Europe [Member] | Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 81,965 74,605 176,126 156,203
Europe [Member] | Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 67,307 63,296 114,841 124,438
Europe [Member] | Specialty Products [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 2,326 3,514 4,961 6,781
Latin America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 123,652 90,866 220,515 173,997
Latin America [Member] | Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 123,508 90,527 220,118 173,291
Latin America [Member] | Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 69 204 275 500
Latin America [Member] | Specialty Products [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 75 135 122 206
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 16,100 22,960 30,408 49,085
Asia [Member] | Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 4,714 11,960 8,535 26,200
Asia [Member] | Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales $ 11,386 $ 11,000 $ 21,873 $ 22,885