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Loans, Debentures, and Finance Leases - Summary of Future Disbursements (Installments) Assumed Under Contracts (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of loans debentures and finance leases [line items]    
Future disbursements R$ 63,194 R$ 68,176
Up to 1 year [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements 5,124 5,113
From 1 to 2 years [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements 5,124 5,113
From 2 to 3 years [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements 5,124 5,113
From 3 to 4 years [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements 5,124 5,113
From 4 to 5 years [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements 5,124 5,113
More than 5 years [member]    
Summary of loans debentures and finance leases [line items]    
Future disbursements R$ 37,574 R$ 42,611