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Risks and Financial Instruments - Positions of derivative financial instruments to hedge commodity price risk (Detail) - Commodity price risk [member]
R$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about financial instruments [line items]        
Fair value R$ 1,302 R$ (563)    
Heating Oil [member] | Term [member]        
Disclosure of detailed information about financial instruments [line items]        
Notional amount (m3) | m³ 167,255 108,429    
Notional amount (USD thousands) | $     $ 103,148 $ 42,399
Fair value R$ 2,269 R$ (563)    
RBOB [member] | Term [member]        
Disclosure of detailed information about financial instruments [line items]        
Notional amount (m3) | m³ 29,413    
Notional amount (USD thousands) | $     $ 17,112
Fair value R$ (967)