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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)