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Risks and Financial Instruments - Summary the position of hedging instruments (Detail)
R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Designated as hedge accounting [member]        
Statement [Line Items]        
Fair value R$ 599,710   R$ 288,854  
Designated as hedge accounting [member] | Foreign exchange swap [member]        
Statement [Line Items]        
Rates agreement-assets USD + 4.58 %      
Rates agreement-liabilities 103.9% DI      
Final maturity nov-23      
Notional amount | $   $ 185,000   $ 245,000
Fair value R$ 298,889   69,298  
Designated as hedge accounting [member] | Foreign exchange swap one [member]        
Statement [Line Items]        
Rates agreement-assets USD + LIBOR-3M + 1.14%      
Rates agreement-liabilities 105.0% DI      
Final maturity jun-22      
Notional amount | $   50,000   150,000
Fair value R$ 94,782   74,970  
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      
Final maturity dec-25      
Notional amount R$ 806,054   806,054  
Fair value R$ 203,837   144,123  
Designated as hedge accounting [member] | Interest rate swap contract one [member]        
Statement [Line Items]        
Rates agreement-assets 6.47%      
Rates agreement-liabilities 99.9% DI      
Final maturity nov-24      
Notional amount R$ 90,000   90,000  
Fair value R$ 3,498   584  
Designated as hedge accounting [member] | Zero cost collar [member]        
Statement [Line Items]        
Rates agreement-assets Put USD 3.86      
Rates agreement-liabilities Call USD 4.33      
Notional amount | $       60,000
Fair value     (121)  
Designated as hedge accounting [member] | NDF [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities USD      
Final maturity jan-21      
Notional amount | $   23,124    
Fair value R$ (733)      
Designated as hedge accounting [member] | Term [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities Heating Oil / RBOB      
Final maturity jan-21      
Notional amount | $   42,399    
Fair value R$ (563)      
Not designated as hedge accounting [member]        
Statement [Line Items]        
Fair value R$ 407,103   398,044  
Not designated as hedge accounting [member] | Foreign exchange swap [member]        
Statement [Line Items]        
Rates agreement-assets USD + 0.18%      
Rates agreement-liabilities 55.5% DI      
Notional amount | $   320,000   853,000
Fair value R$ 519,260   353,451  
Not designated as hedge accounting [member] | Foreign exchange swap one [member]        
Statement [Line Items]        
Rates agreement-assets LIBOR-3M + 2.0%      
Rates agreement-liabilities 105.9% DI      
Notional amount | $       60,000
Fair value     48,535  
Not designated as hedge accounting [member] | Foreign exchange swap two [member]        
Statement [Line Items]        
Rates agreement-assets USD + 0.00%      
Rates agreement-liabilities 33.5% DI      
Notional amount | $       17,896
Fair value     (2,203)  
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%      
Notional amount | $       4,680
Fair value     612  
Not designated as hedge accounting [member] | Interest rate swap contract [member]        
Statement [Line Items]        
Rates agreement-assets 1.9%      
Rates agreement-liabilities 100% DI      
Notional amount R$ 1,300,000      
Fair value R$ (5)      
Not designated as hedge accounting [member] | NDF [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities USD      
Notional amount | $   $ 378,550   71,600
Fair value R$ (112,152)   (1,080)  
Not designated as hedge accounting [member] | Term [member]        
Statement [Line Items]        
Rates agreement-assets BRL      
Rates agreement-liabilities Heating Oil / RBOB      
Notional amount | $       $ 56,000
Fair value     R$ (1,271)