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Related Parties - Additional Information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Apr. 19, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of related party [line items]        
Amortization recognized as general and administrative   R$ 3,922 R$ 11,752 R$ 18,372
total common shares approved as incentive ownership plan 5,564,051      
Percentage of Common shares may deliver to participants to company's share capital 1.00%      
General and administrative expense   R$ 6,001 R$ 784  
Bottom of range [member]        
Disclosure of related party [line items]        
Period of transfter of ownership shares   3 years    
Bottom of range [member] | Deferred stock plan [member]        
Disclosure of related party [line items]        
Deferred stock plan amortization period from grant date   5 years    
Top of range [member]        
Disclosure of related party [line items]        
Period of transfter of ownership shares   6 years    
Top of range [member] | Deferred stock plan [member]        
Disclosure of related party [line items]        
Deferred stock plan amortization period from grant date   7 years