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Risks and Financial Instruments - Sensitivity analysis of floating interest rate risk (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Scenario I [member] |  |
Exposure of interest rate risk |  |
Interest effect on cash equivalents and financial investments | R$ 13,175 | R$ 29,304
Foreign exchange hedging instruments (assets in CDI) effect |  | 55
Interest effect on debt in DI | (19,674) | (44,469)
Interest rate hedging instruments (liabilities in CDI) effect | (1,137) | (39,175)
Incremental expenses, CDI | (7,636) | (54,285)
Interest effect on debt in TJLP | (301) | (1,213)
Incremental expenses, TJLP | (301) | (1,213)
Foreign exchange hedging instruments (assets in LIBOR) effect | 528 | 1,722
Interest effect on debt in LIBOR | (1,410) | (3,551)
Incremental expenses, LIBOR | (882) | (1,829)
Interest effect on debt in SELIC | (41) | (251)
Incremental expenses, SELIC | (41) | (251)
Scenario II [member] |  |
Exposure of interest rate risk |  |
Interest effect on cash equivalents and financial investments | 32,937 | 73,261
Foreign exchange hedging instruments (assets in CDI) effect |  | 137
Interest effect on debt in DI | (49,184) | (111,173)
Interest rate hedging instruments (liabilities in CDI) effect | (11,934) | (85,571)
Incremental expenses, CDI | (28,181) | (123,346)
Interest effect on debt in TJLP | (752) | (3,033)
Incremental expenses, TJLP | (752) | (3,033)
Foreign exchange hedging instruments (assets in LIBOR) effect | 1,320 | 4,305
Interest effect on debt in LIBOR | (3,525) | (8,876)
Incremental expenses, LIBOR | (2,205) | (4,571)
Interest effect on debt in SELIC | (102) | (628)
Incremental expenses, SELIC | (102) | (628)
Scenario III [member] |  |
Exposure of interest rate risk |  |
Interest effect on cash equivalents and financial investments | 65,875 | 146,522
Foreign exchange hedging instruments (assets in CDI) effect |  | 274
Interest effect on debt in DI | (98,368) | (222,345)
Interest rate hedging instruments (liabilities in CDI) effect | (29,929) | (162,897)
Incremental expenses, CDI | (62,422) | (238,446)
Interest effect on debt in TJLP | (1,503) | (6,065)
Incremental expenses, TJLP | (1,503) | (6,065)
Foreign exchange hedging instruments (assets in LIBOR) effect | 2,640 | 8,609
Interest effect on debt in LIBOR | (7,050) | (17,753)
Incremental expenses, LIBOR | (4,410) | (9,144)
Interest effect on debt in SELIC | (203) | (1,257)
Incremental expenses, SELIC | R$ (203) | R$ (1,257)

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