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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% |  |  |

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