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Revenue from Contracts with Customers - Summary of Geographic Disaggregation of Net Sales (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation Of Revenue [Line Items]    
Net sales $ 489,170 $ 499,335
North America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 301,645 308,693
Europe [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 116,899 123,803
Latin America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 51,009 42,515
Asia [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 19,617 24,324
Surfactants [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 349,650 358,940
Surfactants [Member] | North America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 214,297 220,405
Surfactants [Member] | Europe [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 71,478 78,371
Surfactants [Member] | Latin America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 50,812 41,688
Surfactants [Member] | Asia [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 13,063 18,476
Polymers [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 120,179 121,933
Polymers [Member] | North America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 71,323 73,474
Polymers [Member] | Europe [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 42,105 41,784
Polymers [Member] | Latin America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 197 827
Polymers [Member] | Asia [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 6,554 5,848
Specialty Products [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 19,341 18,462
Specialty Products [Member] | North America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 16,025 14,814
Specialty Products [Member] | Europe [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 3,316 3,648
Specialty Products [Member] | Latin America [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales 0 0
Specialty Products [Member] | Asia [Member]    
Disaggregation Of Revenue [Line Items]    
Net sales $ 0 $ 0