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Loans, Debentures, and Finance Leases - Summary of Subsidiary's Loan Maturity (Detail) - 12 months ended Dec. 31, 2018
R$ in Thousands, $ in Millions
BRL (R$)
USD ($)
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil R$ 2,614,704  
Debentures 6,659,455  
Maturity in February 2019 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 168,419  
Maturity in May 2019 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 1,432,750  
Maturity in May 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 337,845  
Maturity in May 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 337,845  
Maturity in May 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Loan maturity, Banco de Brasil 337,845  
Maturity in May 2019 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 168,897  
Maturity in May 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 165,786  
Maturity in May 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 165,786  
Maturity in April 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 657,538  
Maturity in July 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 1,539,274  
Maturity in October 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 727,229  
Maturity In March 2023 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 1,756,954  
Maturity In December 2023 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 644,778  
Maturity In April 2024 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 377,567  
Maturity In October 2024 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 217,861  
Maturity In December 2025 [member]    
Summary of loans debentures and finance leases [line items]    
Debentures 237,785  
Oxiteno USA LLC [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 620,600 $ 160.2
Oxiteno USA LLC [member] | Interest and transaction costs [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 900 0.2
Oxiteno USA LLC [member] | Mature in August 2019 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 38,700 10.0
Oxiteno USA LLC [member] | Mature in February 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 38,700 10.0
Oxiteno USA LLC [member] | Mature in August 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 38,700 10.0
Oxiteno USA LLC [member] | Mature in September 2020 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 77,500 20.0
Oxiteno USA LLC [member] | Mature in February 2021 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 38,700 10.0
Oxiteno USA LLC [member] | Mature in March 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 116,200 30.0
Oxiteno USA LLC [member] | Mature in October 2022 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings 155,000 40.0
Oxiteno USA LLC [member] | Mature in March 2023 [member]    
Summary of loans debentures and finance leases [line items]    
Borrowings R$ 116,200 $ 30.0