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Risks and Financial Instruments - Summary of Credit Risk of Cash, Cash Equivalents and Financial Investments (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of external credit grades [line items]    
Counterparty credit rating R$ 5,712,097 R$ 6,994,406
AAA [member]    
Disclosure of external credit grades [line items]    
Counterparty credit rating 4,906,077 5,933,671
AA [member]    
Disclosure of external credit grades [line items]    
Counterparty credit rating 331,512 707,358
A [member]    
Disclosure of external credit grades [line items]    
Counterparty credit rating 418,020 262,553
BBB [member]    
Disclosure of external credit grades [line items]    
Counterparty credit rating R$ 56,488 R$ 90,824