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Intangible assets - Additional Information (Detail)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Disclosure of detailed information about intangible assets [line items]    
Description of growth rate used to extrapolate cash flow projections 5.00%  
Discounted cash flow projection period 5 years  
Forecast period over cash flow to equity 5 years  
Decrease percentage over cash flow to equity year one 10.00%  
Decrease growth percentage over cash flow to equity year two to five 10.00%  
Decrease of perpetuity rate 250  
Increase of pre tax discount rate 500  
Cash-generating units [member]    
Disclosure of detailed information about intangible assets [line items]    
Explanation of period over which management has projected cash flows The recoverable amount of the Group’s single CGU is determined based on a value in use calculation using cash flow projections from financial budgets approved by senior management covering a five-year period.  
Description of discount rates applied to cash flow projections 9.40% 11.80%
Description of growth rate used to extrapolate cash flow projections 5.00% 6.00%
Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Impairment Loss R$ 0 R$ 4,764