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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation Of Revenue [Line Items]        
Net sales $ 451,582 $ 507,997 $ 1,413,755 $ 1,527,198
North America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 277,231 309,629 873,097 941,991
Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 99,781 116,490 318,045 354,827
Latin America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 52,732 59,538 159,148 159,265
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 21,838 22,340 63,465 71,115
Surfactants [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 299,719 346,884 962,749 1,062,708
Surfactants [Member] | North America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 178,799 205,032 584,816 643,466
Surfactants [Member] | Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 57,190 68,120 183,028 212,556
Surfactants [Member] | Latin America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 51,940 58,560 156,709 156,827
Surfactants [Member] | Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 11,790 15,172 38,196 49,859
Polymers [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 135,089 141,646 395,904 404,446
Polymers [Member] | North America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 84,397 87,720 242,154 248,160
Polymers [Member] | Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 39,852 45,780 126,042 132,592
Polymers [Member] | Latin America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 792 978 2,439 2,438
Polymers [Member] | Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 10,048 7,168 25,269 21,256
Specialty Products [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 16,774 19,467 55,102 60,044
Specialty Products [Member] | North America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 14,035 16,877 46,127 50,365
Specialty Products [Member] | Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 2,739 2,590 8,975 9,679
Specialty Products [Member] | Latin America [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales 0 0 0 0
Specialty Products [Member] | Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Net sales $ 0 $ 0 $ 0 $ 0