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14. Loans, Debentures, and Finance Leases (Details 8) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Transaction costs, beginning R$ 39,792 R$ 18,878
Incurred cost 44,369 28,836
Amortization (12,075) (7,922)
Transaction costs, ending R$ 72,086 R$ 39,792
Notes in the foreign market    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Effective rate of transaction costs 0.00% 0.00%
Transaction costs, beginning R$ 16,612 R$ 0
Incurred cost 0 16,821
Amortization (1,314) (209)
Transaction costs, ending R$ 15,298 R$ 16,612
Banco do Brasil    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Effective rate of transaction costs 0.20% 0.20%
Transaction costs, beginning R$ 12,182 R$ 11,883
Incurred cost 0 3,529
Amortization (4,117) (3,230)
Transaction costs, ending R$ 8,065 R$ 12,182
Debentures    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Effective rate of transaction costs 0.20% 0.10%
Transaction costs, beginning R$ 6,835 R$ 1,801
Incurred cost 42,388 6,407
Amortization (4,514) (1,373)
Transaction costs, ending R$ 44,709 R$ 6,835
Foreign Loans    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Effective rate of transaction costs 0.20% 0.20%
Transaction costs, beginning R$ 2,211 R$ 4,649
Incurred cost 563 0
Amortization (1,561) (2,438)
Transaction costs, ending R$ 1,213 R$ 2,211
Other    
SummaryOfLoansDebenturesAndFinanceLeasesLineItems [Line Items]    
Effective rate of transaction costs 0.20% 0.20%
Transaction costs, beginning R$ 1,952 R$ 545
Incurred cost 1,418 2,079
Amortization (569) (672)
Transaction costs, ending R$ 2,801 R$ 1,952