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Short-term Investments - Summary of Short-term Investments (Parenthetical) (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Short-term Investments [line items]    
Listed securities indexed rate 100.00% 95.00%
Other comprehensive income [member]    
Disclosure of Short-term Investments [line items]    
Change in fair vair in OCI R$ (938) R$ 954