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Loans and Debentures - Summary of Subsidiary's Loan Maturity (Detail) - 12 months ended Dec. 31, 2019
R$ in Thousands, $ in Thousands
BRL (R$)
USD ($)
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil R$ 611,276  
Debentures 6,688,231  
Charges [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 183,304  
Maturity in May 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 205,274  
Maturity in May 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 202,910  
Maturity in May 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 203,092  
Maturity in May 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 166,650  
Maturity in May 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 166,700  
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 1,725,000  
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 240,000  
Oxiteno USA LLC [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 604,741 $ 150,156
Oxiteno USA LLC [member] | Interest and transaction costs [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 627 156
Oxiteno USA LLC [member] | Mature in February 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 40,274 10,000
Oxiteno USA LLC [member] | Mature in August 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 40,274 10,000
Oxiteno USA LLC [member] | Mature in September 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 80,549 20,000
Oxiteno USA LLC [member] | Mature in February 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 40,274 10,000
Oxiteno USA LLC [member] | Mature in March 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 120,823 30,000
Oxiteno USA LLC [member] | Mature in October 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 161,097 40,000
Oxiteno USA LLC [member] | Mature in March 2023 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings R$ 120,823 $ 30,000