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Loans, financing, debentures and hedge derivative financial instruments - Summary of Foreign Loan Maturity (Detail) - 12 months ended Dec. 31, 2020 - IPP [member] - Foreign loans [member]
R$ in Thousands, $ in Thousands
BRL (R$)
USD ($)
Summary of loans debentures and finance leases [line items]    
Loan maturity, amount R$ 1,308,928 $ 251,877
Cost in percentage of DI 104.10% 104.10%
Charges [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, amount R$ 87,703 $ 16,877
Foreign loan one [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date Jul/2021 Jul/2021
Loan maturity, amount R$ 311,802 $ 60,000
Cost in percentage of DI 101.80% 101.80%
Foreign loan two [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date Jun/2022 Jun/2022
Loan maturity, amount R$ 259,835 $ 50,000
Cost in percentage of DI 105.00% 105.00%
Foreign loan three [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date Sep/2023 Sep/2023
Loan maturity, amount R$ 311,802 $ 60,000
Cost in percentage of DI 105.00% 105.00%
Foreign loan four [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, date Sep/2023 Sep/2023
Loan maturity, amount R$ 337,786 $ 65,000
Cost in percentage of DI 104.80% 104.80%