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Commitments - Additional Information (Detail)
R$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
R$ / Ton
Ton
Dec. 31, 2017
BRL (R$)
Dec. 31, 2016
BRL (R$)
Dec. 31, 2018
USD ($)
R$ / Ton
Disclosure of commitments and contingencies [line items]        
Minimum annual consumption level of ethylene | Ton 205,000      
Minimum purchase of ethylene annually | Ton 44,100      
Operating lease expense | R$ R$ 189,008 R$ 160,465 R$ 101,330  
Aratu [member]        
Disclosure of commitments and contingencies [line items]        
Cargo rates per ton | R$ / Ton 6.99     6.99
Suape [member]        
Disclosure of commitments and contingencies [line items]        
Cargo rates per ton | R$ / Ton 2.54     2.54
Third parties [member]        
Disclosure of commitments and contingencies [line items]        
Liability insurance policies R$ 1,550,000     $ 400
directors and executive officers (D&O) [member]        
Disclosure of commitments and contingencies [line items]        
Liability insurance policies R$ 310,000     $ 80