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Short-term Investments - Summary of Short-term Investments (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Short-term Investments [line items]    
Equity securities R$ 240 R$ 8,518
Short-term investments 2,937,029 2,770,589
Bonds [member]    
Disclosure of Short-term Investments [line items]    
Listed securities 2,927,002 2,752,743
Investment funds [member]    
Disclosure of Short-term Investments [line items]    
Unlisted securities R$ 9,787 R$ 9,328