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Risks and Financial Instruments - Additional Information (Detail)
$ / shares in Units, R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Disclosure of detailed information about financial instruments [line items]        
Net liability position R$ 1,553,435 R$ 1,488,971    
Number of customer or group accounts for more than 10% of total revenue 0      
Investment plan R$ 1,890,763      
Cash, cash equivalents, and short-term financial investments 7,694,752      
Notional amount of foreign exchange hedging instruments for highly probable future transactions designated as fair value hedge, related to notes in the foreign market | $     $ 468,215 $ 550,000
Unrealized loss of other comprehensive income, net of deferred income and social contribution taxes 315,403 293,277    
Notional amount of foreign exchange hedging instruments for highly probable future transactions designated as cash flow hedge, related to future sales revenues | $       60,000
Unrealized loss of other comprehensive income, net of deferred IRPJ and CSLL   74    
Balance of foreign exchange hedging instruments designated as net investments hedge in foreign entities | $     $ 95,000 $ 95,000
Unrealized loss of other comprehensive income, net of deferred income and social contribution taxes 73,108 R$ 55,682    
Maturity of foreign exchange hedging instruments | $ / shares     $ 8.23 $ 5.76
Later than one year [member]        
Disclosure of detailed information about financial instruments [line items]        
Gross indebtedness R$ 3,620,550      
Scenario I [member]        
Disclosure of detailed information about financial instruments [line items]        
Floating interest rate variation 10.00%      
Likely scenario pre-fixed interest rate deterioration. 10.00%      
Scenario II [member]        
Disclosure of detailed information about financial instruments [line items]        
Floating interest rate variation 25.00%      
Likely scenario pre-fixed interest rate deterioration. 25.00%      
Scenario III [member]        
Disclosure of detailed information about financial instruments [line items]        
Floating interest rate variation 50.00%      
Likely scenario pre-fixed interest rate deterioration. 50.00%