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Presentation of Financial Statements and Summary of Significant Accounting Policies - Additional Information (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2015
BRL (R$)
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Research and development expense recognized R$ 63,085 R$ 55,836 R$ 50,129  
Cumulative translation adjustments 65,857 53,061 7,519 R$ 66,925
Impairment loss recognized 5,565      
Gains and losses from changes in foreign investments 4,090 R$ 7,368 3,425  
Impairment loss 5,565   2,114  
Oxiteno S. A. Industria e Comercio [member]        
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Impairment loss recognized R$ 5,565      
Purchase Exchange Rate [member]        
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Variable exchange rate VES/US$ 638.18      
Sale Exchange Rate [member]        
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Variable exchange rate VES/US$ 636.58      
Goodwill [member]        
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Impairment loss     1,695  
Intangible assets other than goodwill [member]        
Basis Of Presentation And Summary Of Significant Accounting Policies [line items]        
Impairment loss     R$ 419