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Loans, Debentures, and Finance Leases - Summary of Foreign Loan Maturity (Detail) - 12 months ended Dec. 31, 2018 R$ in Millions, $ in Millions | BRL (R$) | USD ($)
--- | --- | ---
Summary of loans debentures and finance leases [line items] |  |
Cost in percentage of CDI | 104.40% | 104.40%
Loan maturity, amount | R$ 1,567.4 | $ 404.5
Foreign loan one [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 21-Jun | 21-Jun
Loan maturity, amount | R$ 36.8 | $ 9.5
Foreign loan two [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 21-Jul | 21-Jul
Cost in percentage of CDI | 105.00% | 105.00%
Loan maturity, amount | R$ 387.5 | $ 100.0
Foreign loan three [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 23-Jul | 23-Jul
Cost in percentage of CDI | 101.80% | 101.80%
Loan maturity, amount | R$ 232.5 | $ 60.0
Foreign loan four [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 23-Sep | 23-Sep
Cost in percentage of CDI | 104.80% | 104.80%
Loan maturity, amount | R$ 193.7 | $ 50.0
Foreign loan five [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 23-Sep | 23-Sep
Cost in percentage of CDI | 105.00% | 105.00%
Loan maturity, amount | R$ 232.5 | $ 60.0
Foreign loan six [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Loan maturity, date | 23-Nov | 23-Nov
Cost in percentage of CDI | 104.70% | 104.70%
Loan maturity, amount | R$ 251.9 | $ 65.0
Foreign loan seven [member] |  |
Summary of loans debentures and finance leases [line items] |  |
Cost in percentage of CDI | 104.50% | 104.50%
Loan maturity, amount | R$ 232.5 | $ 60.0

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