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Loans and Debentures - Summary of Foreign Loan Maturity (Detail) - 12 months ended Dec. 31, 2019
R$ in Thousands, $ in Thousands
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$ 1,666,092 $ 413,351
Charges [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, amount R$ 73,965 $ 18,351
Foreign loan one [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 21-Jul 21-Jul
Cost in percentage of CDI 101.80% 101.80%
Loan maturity, amount R$ 241,842 $ 60,000
Foreign loan two [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date 22-Jun 22-Jun
Cost in percentage of CDI 105.00% 105.00%
Loan maturity, amount R$ 403,070 $ 100,000
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 104.80% 104.80%
Loan maturity, amount R$ 201,535 $ 50,000
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 105.00% 105.00%
Loan maturity, amount R$ 241,842 $ 60,000
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 104.70% 104.70%
Loan maturity, amount R$ 261,996 $ 65,000
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 104.50% 104.50%
Loan maturity, amount R$ 241,842 $ 60,000