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8. Related Parties (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets R$ 490 R$ 490  
Loans liabilities 4,185 4,272  
Commercial transactions receivables 1,067 7,259  
Commercial transactions payables 23,719 25,540  
Commercial transactions, sales and services 7,245 13,335 R$ 18,211
Commercial transactions purchases 1,022,997 977,510 627,367
Oxicap Industria de Gases      
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets 0 0  
Loans liabilities 0 0  
Commercial transactions receivables 0 0  
Commercial transactions payables 1,489 1,534  
Commercial transactions, sales and services 6 6 6
Commercial transactions purchases 18,108 18,079 12,353
Quimica da Bahia Industria e Comercio      
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets 0 0  
Loans liabilities 2,946 2,946  
Commercial transactions receivables 0 0  
Commercial transactions payables 0 0  
ConectCar Solucoes de Mobilidade Eletronica      
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets 0 0  
Loans liabilities 0 0  
Commercial transactions receivables 1,067 7,259  
Commercial transactions payables 31 5,820  
Commercial transactions, sales and services 7,239 13,329 18,205
Commercial transactions purchases 859 1,424 0
Refinaria de Petroleo Riograndense      
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets 0 0  
Loans liabilities 0 0  
Commercial transactions receivables 0 0  
Commercial transactions payables 22,199 18,186  
Commercial transactions, sales and services 0 0 0
Commercial transactions purchases 1,004,030 958,007 R$ 615,014
Others      
SummaryOfRelatedPartiesLineItems [Line Items]      
Loans assets 490 490  
Loans liabilities 1,239 1,326  
Commercial transactions receivables 0 0  
Commercial transactions payables R$ 0 R$ 0