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Loans, Debentures, and Finance Leases - Summary of Foreign Loan Maturity (Detail) - 12 months ended Dec. 31, 2018
R$ in Millions, $ in Millions
BRL (R$)
USD ($)
Summary of loans debentures and finance leases [line items]    
Cost in percentage of CDI 104.40% 104.40%
Loan maturity, amount R$ 1,567.4 $ 404.5
Foreign loan one [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 21-Jun 21-Jun
Loan maturity, amount R$ 36.8 $ 9.5
Foreign loan two [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 21-Jul 21-Jul
Cost in percentage of CDI 105.00% 105.00%
Loan maturity, amount R$ 387.5 $ 100.0
Foreign loan three [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 23-Jul 23-Jul
Cost in percentage of CDI 101.80% 101.80%
Loan maturity, amount R$ 232.5 $ 60.0
Foreign loan four [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 23-Sep 23-Sep
Cost in percentage of CDI 104.80% 104.80%
Loan maturity, amount R$ 193.7 $ 50.0
Foreign loan five [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 23-Sep 23-Sep
Cost in percentage of CDI 105.00% 105.00%
Loan maturity, amount R$ 232.5 $ 60.0
Foreign loan six [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 23-Nov 23-Nov
Cost in percentage of CDI 104.70% 104.70%
Loan maturity, amount R$ 251.9 $ 65.0
Foreign loan seven [member]    
Summary of loans debentures and finance leases [line items]    
Cost in percentage of CDI 104.50% 104.50%
Loan maturity, amount R$ 232.5 $ 60.0