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Loans, Debentures, and Finance Leases - Summary of Appropriated Profit or Loss in The Future (Detail)
R$ in Thousands
Dec. 31, 2017
BRL (R$)
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future R$ 76,457
Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 17,897
From 1 to 2 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 16,467
From 2 to 3 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 15,679
From 3 to 4 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 12,292
From 4 to 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 7,076
More than 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 7,046
Notes in foreign market [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 13,881
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 1,435
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 1,546
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 1,632
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 1,723
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 1,819
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 5,726
Banco do Brasil [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 3,437
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 2,317
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 599
Banco do Brasil [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 385
Banco do Brasil [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 136
Debentures [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 56,376
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 13,171
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 13,298
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 13,217
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 10,115
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 5,255
Debentures [member] | More than 5 years [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 1,320
Foreign loans [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 331
Foreign loans [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 201
Foreign loans [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 130
Other transaction costs [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 2,432
Other transaction costs [member] | Up to 1 year [member]  
Summary of loans debentures and finance leases [line items]  
Amount appropriated to profit or loss in the future 773
Other transaction costs [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 894
Other transaction costs [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 445
Other transaction costs [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 318
Other transaction costs [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 R$ 2