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Risks and Financial Instruments - Sensitivity analysis of floating interest rate risk (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | [1] | Dec. 31, 2019 | [1]
Exposure of interest rate risk |  |  |
Interest effect on debt | R$ 410,430 | R$ 337,324 | R$ 459,995
Scenario Base [member] | DI [member] |  |  |
Exposure of interest rate risk |  |  |
Interest effect on cash equivalents and financial investments | (153,160) |  |
Interest effect on debt | 360,652 |  |
Interest rate hedging instruments (liabilities in DI) effect | (221,157) |  |
Incremental expenses | (428,649) |  |
Scenario Base [member] | TJLP [member] |  |  |
Exposure of interest rate risk |  |  |
Interest effect on debt | 7 |  |
Incremental expenses | (7) |  |
Scenario Base [member] | LIBOR [member] |  |  |
Exposure of interest rate risk |  |  |
Foreign exchange hedging instruments (assets in LIBOR) effect | (11) |  |
Interest effect on debt | 94 |  |
Incremental expenses | R$ (83) |  |
[1] | For further details, see Note 3.c.3.

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