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Financial Instruments - Sensitivity Analysis Of The Interest Rate Risks (Detail) - Interest rate risk [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Disclosure of risk management strategy related to hedge accounting [line items]  
Impact on profit or loss before tax R$ (1,738)
Short Term Investments [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Interest rate risk CDI variation
Book value R$ 2,758,265
Reasonably possible change in basis points 10.00%
Impact on profit or loss before tax R$ 1,103
Loans and Financing [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Interest rate risk CDI variation
Book value R$ (2,910,550)
Reasonably possible change in basis points 10.00%
Impact on profit or loss before tax R$ (1,261)
FIDC Senior Quota Holders [member]  
Disclosure of risk management strategy related to hedge accounting [line items]  
Interest rate risk CDI variation
Book value R$ (3,710,894)
Reasonably possible change in basis points 10.00%
Impact on profit or loss before tax R$ (1,581)