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Employee Benefits and Private Pension Plan - Post-employment Benefits (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Summary of employee benefits [line items]        
Total R$ 249,815 R$ 237,523   R$ 144,751
Current 45,655 30,059 R$ 24,940  
Non-current 204,160 207,464 R$ 119,811  
Health and dental care plan [member]        
Summary of employee benefits [line items]        
Total 112,628 99,767    
Indemnification of FGTS [member]        
Summary of employee benefits [line items]        
Total 83,781 81,831    
Seniority bonus [member]        
Summary of employee benefits [line items]        
Total 37,397 40,254    
Life insurance [member]        
Summary of employee benefits [line items]        
Total R$ 16,009 R$ 15,671