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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, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Net liability position R$ (5,950,168) R$ (5,625,838)
DI [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (5,952,953) (5,283,509)
DI [member] | Cash equivalents [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position 1,943,164 2,241,852
DI [member] | Financial investments [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position 1,607,608 3,749,852
DI [member] | Loans and debentures [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (4,855,517) (6,947,362)
DI [member] | Liability position foreign exchange hedging instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (2,283,625) (2,124,146)
DI [member] | Liability position of fixed interest instruments + IPCA – DI [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (2,364,583) (2,203,705)
TJLP [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (326) (29,803)
TJLP [member] | Loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position (326) (29,803)
LIBOR [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position 3,111 (312,526)
LIBOR [member] | Asset position of foreign exchange hedging instruments [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position 279,047 260,958
LIBOR [member] | Loans [member]    
Disclosure of detailed information about financial instruments [line items]    
Net liability position R$ (275,936) R$ (573,484)