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Loans and Debentures - Summary of Transaction Costs (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of loans debentures and finance leases [line items]      
Transaction costs, beginning R$ 76,457 R$ 72,086 R$ 39,792
Incurred cost 19,134 21,674 44,369
Amortization (23,825) (17,303) (12,075)
Transaction costs, ending R$ 71,766 76,457 R$ 72,086
Notes in foreign market [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.10%   0.00%
Transaction costs, beginning R$ 13,881 15,298 R$ 16,612
Incurred cost 18,442    
Amortization (4,209) (1,417) (1,314)
Transaction costs, ending R$ 28,114 R$ 13,881 R$ 15,298
Banco do Brasil [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$ 3,437 R$ 8,065 R$ 12,182
Amortization (2,667) (4,628) (4,117)
Transaction costs, ending R$ 770 R$ 3,437 R$ 8,065
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$ 56,376 R$ 44,709 R$ 6,835
Incurred cost 692 21,308 42,388
Amortization (15,662) (9,641) (4,514)
Transaction costs, ending R$ 41,406 R$ 56,376 R$ 44,709
Foreign loans [member]      
Summary of loans debentures and finance leases [line items]      
Effective rate of transaction costs 0.00% 0.10% 0.20%
Transaction costs, beginning R$ 331 R$ 1,213 R$ 2,211
Incurred cost 563    
Amortization (237) (882) (1,561)
Transaction costs, ending R$ 94 R$ 331 R$ 1,213
Other transaction costs [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$ 2,432 R$ 2,801 R$ 1,952
Incurred cost   366 1,418
Amortization (1,050) (735) (569)
Transaction costs, ending R$ 1,382 R$ 2,432 R$ 2,801