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Risks and Financial Instruments - Value of gains (losses) recognized (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit or loss [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments R$ 56.2 R$ (157.2) R$ (196.8)
Profit or loss [member] | Exchange Rate Swap Receivable In U S Dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 181.5 (72.1) (177.0)
Profit or loss [member] | Exchange rate swap payable in us dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (3.8) 3.2 9.2
Profit or loss [member] | Interest rate swaps brl [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 12.5 15.9 (0.5)
Profit or loss [member] | Nonderivative Financial Instruments [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (134.0) (104.2) (28.5)
Equity [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments (289.4) (31.4) (28.7)
Equity [member] | Exchange Rate Swap Receivable In U S Dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments   5.3 (13.8)
Equity [member] | Exchange rate swap payable in us dollars [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments 0.2    
Equity [member] | Nonderivative Financial Instruments [member]      
Summary of risks and financial instruments [line items]      
Gain (loss) on hedging instruments R$ (289.6) R$ (36.7) R$ (14.9)