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Related Parties - Summary of Subsidiaries and Other Related Parties (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of related parties [line items]      
Loans assets R$ 490 R$ 490  
Loans liabilities 4,071 4,185  
Receivables 1,042 1,067  
Payables 25,450 23,844  
Commercial transactions, sales and services 3,850 7,245 R$ 13,335
Commercial transactions purchases 1,018,078 1,022,997 977,510
Expenses 1,469 2,300 2,478
Quimica da bahia Industria e Comercio [member]      
Summary of related parties [line items]      
Loans liabilities 2,925 2,946  
Others [member]      
Summary of related parties [line items]      
Loans assets 490 490  
Loans liabilities 1,146 1,239  
Oxicap Industria de Gases [member]      
Summary of related parties [line items]      
Payables 567 1,489  
Commercial transactions, sales and services 6 6 6
Commercial transactions purchases 9,032 18,108 18,079
Refinaria De Petroleo Rigrandense [member]      
Summary of related parties [line items]      
Payables 24,630 22,199  
Commercial transactions purchases 1,008,860 1,004,030 958,007
ConectCar Solucoes de Mobilidade Eletronica [member]      
Summary of related parties [line items]      
Receivables 1,042 1,067  
Payables 136 31  
Commercial transactions, sales and services 3,844 7,239 13,329
Commercial transactions purchases 186 859 1,424
LA'7 Participaes e Empreend. Imob. Ltda. [member]      
Summary of related parties [line items]      
Payables 117 125  
Expenses R$ 1,469 R$ 2,300 R$ 2,478