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Financial Instruments - Additional Information (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Interest rate risks 5.78%  
Financial assets R$ 17,418,352 R$ 12,076,375
Transfers between Level I and Level II fair value measurements 0 0
Transfers between Level II and Level III fair value measurements 0 0
Short term investment [member]    
Disclosure of detailed information about financial instruments [line items]    
Financial assets R$ 2,937,029 R$ 2,770,589
Brazilian Central Bank [member]    
Disclosure of detailed information about financial instruments [line items]    
Percentage of monthly average of payment equity 2.00%