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Loans, financing, debentures and hedge derivative financial instruments - Summary of Subsidiary's Loan Maturity (Detail) - 12 months ended Dec. 31, 2020
R$ in Thousands, $ in Thousands
BRL (R$)
USD ($)
USD ($)
Summary of loans debentures and finance leases [line items]      
Loan maturity, Banco de Brasil R$ 407,420    
Debentures 6,544,116    
Charges [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 205,533    
Maturity in May 2021 [member]      
Summary of loans debentures and finance leases [line items]      
Loan maturity, Banco de Brasil 204,328    
Maturity in May 2022 [member]      
Summary of loans debentures and finance leases [line items]      
Loan maturity, Banco de Brasil 203,092    
Maturity in May 2021 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 166,670    
Maturity in July 2021 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 750,000    
Maturity in April 2022 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 660,139    
Maturity in July 2022 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 750,000    
Maturity In October 2022 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 730,384    
Maturity In March 2023 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 1,725,336    
Maturity In December 2023 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 660,000    
Maturity In April 2024 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 352,361    
Maturity In October 2024 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 213,693    
Maturity In November 2024 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures 90,000    
Maturity In December 2025 [member]      
Summary of loans debentures and finance leases [line items]      
Debentures R$ 240,000    
Oxiteno USA LLC [member]      
Summary of loans debentures and finance leases [line items]      
Borrowings, interest rate basis LIBOR + 1.4% LIBOR + 1.4%  
Borrowings R$ 312,200   $ 60,003
Loans paid off in advance | $   $ 70,000  
Oxiteno USA LLC [member] | Charges [member]      
Summary of loans debentures and finance leases [line items]      
Borrowings 15   3
Oxiteno USA LLC [member] | Mature in March 2021 [member]      
Summary of loans debentures and finance leases [line items]      
Borrowings R$ 312,185   $ 60,000