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Group structure - Summary of Intangible Assets Acquired (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Aug. 10, 2017
Dec. 31, 2019
Customer list [member]    
Disclosure of detailed information about business combination [line items]    
Amount R$ 50,077  
Method Multi-period excess earning method  
Expected amortization period   8 years
Trademarks [member]    
Disclosure of detailed information about business combination [line items]    
Amount R$ 19,304  
Method Relief from royalty  
Expected amortization period   10 years
Technology [member]    
Disclosure of detailed information about business combination [line items]    
Amount R$ 2,028  
Method Relief from royalty  
Expected amortization period   3 years