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Loans, financing, debentures and hedge derivative financial instruments - Summary of Foreign Loan Maturity (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Disclosure of detailed information about borrowings [line items]          
Loan maturity, amount R$ 16,377,643   R$ 17,376,216 R$ 14,392,722 R$ 15,116,139
IPP [member] | Foreign loans [member]          
Disclosure of detailed information about borrowings [line items]          
Loan maturity, amount R$ 1,011,374 $ 181,234      
Cost in percentage of DI 104.90% 104.90%      
Charges [member] | IPP [member] | Foreign loans [member]          
Disclosure of detailed information about borrowings [line items]          
Loan maturity, amount [1] R$ 34,786 $ 6,234      
Cost in percentage of DI [1]      
Foreign loan one [member] | IPP [member] | Foreign loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, maturity date Jun/2022        
Loan maturity, amount R$ 279,025 $ 50,000      
Cost in percentage of DI 105.00% 105.00%      
Foreign loan two [member] | IPP [member] | Foreign loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, maturity date Sep/2023        
Loan maturity, amount R$ 334,830 $ 60,000      
Cost in percentage of DI 105.00% 105.00%      
Foreign loan three [member] | IPP [member] | Foreign loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings, maturity date Sep/2023        
Loan maturity, amount R$ 362,733 $ 65,000      
Cost in percentage of DI 104.80% 104.80%      
[1] Includes interest, transaction costs and fair value adjustments.