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Loans, financing, debentures and hedge derivative financial instruments - Summary of Transaction Costs (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of loans debentures and finance leases [line items]      
Transaction costs, beginning R$ 71,766 R$ 76,457 R$ 72,086
Incurred cost 20,065 19,134 21,674
Amortization (24,721) (23,825) (17,303)
Transaction costs, ending R$ 67,110 R$ 71,766 R$ 76,457
Debentures [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.20% 0.20% 0.20%
Transaction costs, beginning R$ 41,406 R$ 56,376 R$ 44,709
Incurred cost   692 21,308
Amortization (13,058) (15,662) (9,641)
Transaction costs, ending R$ 28,348 R$ 41,406 R$ 56,376
Notes in foreign market [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.10% 0.10% 0.00%
Transaction costs, beginning R$ 28,114 R$ 13,881 R$ 15,298
Incurred cost 13,263 18,442  
Amortization (4,265) (4,209) (1,417)
Transaction costs, ending R$ 37,112 R$ 28,114 R$ 13,881
Notes [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.50%    
Incurred cost R$ 6,802    
Amortization (5,484)    
Transaction costs, ending R$ 1,318    
Banco do Brasil [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.10% 0.20% 0.20%
Transaction costs, beginning R$ 770 R$ 3,437 R$ 8,065
Amortization (438) (2,667) (4,628)
Transaction costs, ending R$ 332 R$ 770 R$ 3,437
Foreign loans [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.00% 0.00% 0.10%
Transaction costs, beginning R$ 94 R$ 331 R$ 1,213
Amortization R$ (94) (237) (882)
Transaction costs, ending   R$ 94 R$ 331
Othes [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.00% 0.20% 0.20%
Transaction costs, beginning R$ 1,382 R$ 2,432 R$ 2,801
Incurred cost     366
Amortization R$ (1,382) (1,050) (735)
Transaction costs, ending   R$ 1,382 R$ 2,432