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Loans, financing, debentures and hedge derivative financial instruments - Summary of Appropriated Profit or Loss in The Future (Detail)
R$ in Thousands
Dec. 31, 2020
BRL (R$)
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future R$ 67,110
Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 18,868
From 1 to 2 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 14,242
From 2 to 3 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 10,214
From 3 to 4 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 6,052
From 4 to 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 5,117
More than 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 12,617
Debentures [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 28,348
Debentures [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 12,403
Debentures [member] | From 1 to 2 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 9,274
Debentures [member] | From 2 to 3 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 5,318
Debentures [member] | From 3 to 4 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 1,139
Debentures [member] | From 4 to 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 214
Notes in foreign market [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 37,112
Notes in foreign market [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 4,890
Notes in foreign market [member] | From 1 to 2 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 4,893
Notes in foreign market [member] | From 2 to 3 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 4,896
Notes in foreign market [member] | From 3 to 4 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 4,913
Notes in foreign market [member] | From 4 to 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 4,903
Notes in foreign market [member] | More than 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 12,617
Notes [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 1,318
Notes [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 1,318
Banco do Brasil [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 332
Banco do Brasil [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 257
Banco do Brasil [member] | From 1 to 2 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future R$ 75