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Risks and Financial Instruments - Summary of Foreign Exchange Hedging Instruments Designated as Fair Value Hedge (Detail)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
USD ($)
Foreign exchange hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ | $   $ 395.0   $ 320.0
Result of hedging instruments - gain/(loss) - R$ R$ 149.2   R$ (143.4)  
Fair value adjustment of debt - R$ (28.5)   16.5  
Financial expense in the statements of profit or loss - R$ R$ (215.9)   R$ (4.1)  
Average effective cost - CDI % 104.40% 104.40% 102.70% 102.70%
Interest rate hedging instruments [member]        
Disclosure of detailed information about hedges [line items]        
Notional amount - R$ R$ 806.1   R$ 566.1  
Result of hedging instruments - gain/(loss) - R$ 25.8   (3.3)  
Fair value adjustment of debt - R$ (13.3)   19.1  
Financial expense in the statements of profit or loss - R$ R$ (50.2)   R$ (18.5)  
Average effective cost - CDI % 95.80% 95.80% 95.20% 95.20%