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Risks and Financial Instruments - Sensitivity analysis of assets and liabilities in foreign currency (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Scenario I [member]    
Summary of risks and financial instruments [line items]    
Income statement effect R$ 18,631 R$ 45,218
Equity effect (173,974) (194,115)
Total (155,343) (148,897)
Income statement effect (18,631) (45,218)
Equity effect 173,974 194,115
Total 155,343 148,897
Scenario II [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 46,577 113,045
Equity effect (434,935) (485,287)
Total (388,358) (372,242)
Income statement effect (46,577) (113,045)
Equity effect 434,935 485,287
Total 388,358 372,242
Scenario III [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 93,153 226,089
Equity effect (869,871) (970,575)
Total (776,718) (744,486)
Income statement effect (93,153) (226,089)
Equity effect 869,871 970,575
Total R$ 776,718 R$ 744,486