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Risks and Financial Instruments - Financial assets and liabilities exposed to floating interest rates (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of risks and financial instruments [line items]    
Net liability position R$ (5,625,838) R$ (6,739,151)
DI [member]    
Summary of risks and financial instruments [line items]    
Net liability position (5,283,509) (5,997,858)
DI [member] | Cash equivalent [member]    
Summary of risks and financial instruments [line items]    
Net liability position 2,241,852 1,780,939
DI [member] | Financial Investments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 3,749,852 2,610,686
DI [member] | Asset position foreign exchange hedging [member]    
Summary of risks and financial instruments [line items]    
Net liability position 19,323
DI [member] | Loans and debentures [member]    
Summary of risks and financial instruments [line items]    
Net liability position (6,947,362) (6,268,615)
DI [member] | Liability position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position (2,124,146) (3,318,289)
DI [member] | Liability position hedging instruments pre fixed [member]    
Summary of risks and financial instruments [line items]    
Net liability position (2,203,705) (821,902)
TJLP [member]    
Summary of risks and financial instruments [line items]    
Net liability position (29,803) (103,945)
TJLP [member] | Loans tjlp [member]    
Summary of risks and financial instruments [line items]    
Net liability position (29,803) (103,945)
LIBOR [member]    
Summary of risks and financial instruments [line items]    
Net liability position (312,526) (606,956)
LIBOR [member] | Asset position foreign exchange hedging instruments [member]    
Summary of risks and financial instruments [line items]    
Net liability position 260,958 850,307
LIBOR [member] | Loans libor [member]    
Summary of risks and financial instruments [line items]    
Net liability position (573,484) (1,457,263)
SELIC [member]    
Summary of risks and financial instruments [line items]    
Net liability position (30,392)
SELIC [member] | Loans selic [member]    
Summary of risks and financial instruments [line items]    
Net liability position R$ (30,392)