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Loans, financing, debentures and hedge derivative financial instruments - Summary of Changes in Loans, Debentures and Finance Leases (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loans debentures and finance leases details 1 [abstract]    
Loans, debentures and finance leases, beginning R$ 14,362,737 R$ 15,116,139
New loans and debentures with cash effect 3,591,624 2,105,737
Interest accrued 757,161 845,844
Principal payment (2,795,002) (2,644,704)
Interest payment (740,853) (1,469,780)
Monetary and exchange rate variation 2,048,688 296,441
Change in fair value 34,702 113,060
Loans, debentures and finance leases, ending R$ 17,259,057 R$ 14,362,737