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Loans, financing, debentures and hedge derivative financial instruments - Summary of Collateral to Financial Institutions (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
IPP [member]    
Statement [line items]    
Maximum amount of future payments related to these collaterals R$ 330,944 R$ 81,344
Maturities of up to 46 months 60 months
Fair value of collaterals R$ 5,496 R$ 1,237
Oxiteno [member]    
Statement [line items]    
Maximum amount of future payments related to these collaterals   R$ 2,753
Maturities of up to   4 months
Fair value of collaterals   R$ 68