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Risks and Financial Instruments - Summary the position of hedging instruments (Detail)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
USD ($)
Designated as hedge accounting [member]        
Statement [Line Items]        
Fair value R$ 288.9   R$ 71.2  
Designated as hedge accounting [member] | Foreign exchange swap [member]        
Statement [Line Items]        
Rates agreement-assets USD + 4.51 %      
Rates agreement-liabilities 104.0% DI      
Maturity nov-23      
Notional amount | $   $ 245.0   $ 245.0
Fair value R$ 69.3   (10.3)  
Designated as hedge accounting [member] | Foreign exchange swap one [member]        
Statement [Line Items]        
Rates agreement-assets LIBOR-3M + 1.11% = 4.1%      
Rates agreement-liabilities 105.0% DI      
Maturity jul-23      
Notional amount | $   150.0   150.0
Fair value R$ 75.0   45.6  
Designated as hedge accounting [member] | Interest rate swap contract [member]        
Statement [Line Items]        
Rates agreement-assets 4.57% + IPCA      
Rates agreement-liabilities 95.8% DI      
Maturity oct-24      
Notional amount R$ 806.1   806.1  
Fair value R$ 144.1   35.6  
Designated as hedge accounting [member] | Interest rate swap contract one [member]        
Statement [Line Items]        
Rates agreement-assets 6.47%      
Rates agreement-liabilities 100% DI      
Maturity nov-24      
Notional amount R$ 90.0      
Fair value R$ 0.6      
Designated as hedge accounting [member] | Zero cost collar [member]        
Statement [Line Items]        
Rates agreement-assets Put USD 3.68      
Rates agreement-liabilities Call USD 4.60      
Maturity dec-20      
Notional amount | $   60.0   149.4
Fair value R$ (0.1)   0.3  
Not designated as hedge accounting [member]        
Statement [Line Items]        
Fair value R$ 398.0   276.0  
Not designated as hedge accounting [member] | Foreign exchange swap [member]        
Statement [Line Items]        
Rates agreement-assets USD + 3.60%      
Rates agreement-liabilities 65.0% DI      
Maturity jun-29      
Notional amount | $   853.0   758.3
Fair value R$ 353.5   246.5  
Not designated as hedge accounting [member] | Foreign exchange swap one [member]        
Statement [Line Items]        
Rates agreement-assets LIBOR-3M + 2.0% = 4.3%      
Rates agreement-liabilities 105.9% DI      
Maturity jun-20      
Notional amount | $   60.0   60.0
Fair value R$ 48.5   38.0  
Not designated as hedge accounting [member] | Foreign exchange swap two [member]        
Statement [Line Items]        
Rates agreement-assets USD + 0.00%      
Rates agreement-liabilities 39.9% DI      
Maturity oct-19      
Notional amount | $   17.9   98.5
Fair value R$ (2.2)   (8.6)  
Not designated as hedge accounting [member] | Foreign exchange swap three [member]        
Statement [Line Items]        
Rates agreement-assets 34.8% DI      
Rates agreement-liabilities USD + 0.00%      
Maturity feb-20      
Notional amount | $   4.7   $ 8.9
Fair value R$ 0.6   R$ 0.1  
Not designated as hedge accounting [member] | NDF [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities USD      
Maturity jan-20      
Notional amount | $   71.6    
Fair value R$ (1.1)      
Not designated as hedge accounting [member] | Term [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities Heating oil / RBOB      
Maturity jan-20      
Notional amount | $   $ 56.0    
Fair value R$ (1.3)