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Intangible assets (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in cost and accumulated amortization were as follows    
Opening balance R$ 86,108  
Additions 125,856  
Acquisition of subsidiary 1,429  
Amortization (54,526)  
Net book value 158,868 R$ 86,108
Cost    
Changes in cost and accumulated amortization were as follows    
Net book value 276,667 149,382
Accumulated amortization    
Changes in cost and accumulated amortization were as follows    
Net book value (117,799) (63,274)
Expenditures related to software and technology    
Changes in cost and accumulated amortization were as follows    
Opening balance 82,131  
Additions 97,491  
Acquisition of subsidiary 10  
Amortization (53,807)  
Net book value 125,825 82,131
Expenditures related to software and technology | Cost    
Changes in cost and accumulated amortization were as follows    
Net book value 241,490 143,989
Expenditures related to software and technology | Accumulated amortization    
Changes in cost and accumulated amortization were as follows    
Net book value (115,665) (61,858)
Software licenses    
Changes in cost and accumulated amortization were as follows    
Opening balance 3,977  
Additions 1,210  
Acquisition of subsidiary 1,419  
Transfer 1,488  
Amortization (627)  
Net book value 7,467 3,977
Software licenses | Cost    
Changes in cost and accumulated amortization were as follows    
Net book value 9,510 5,393
Software licenses | Accumulated amortization    
Changes in cost and accumulated amortization were as follows    
Net book value (2,043) R$ (1,416)
Customer relationships    
Changes in cost and accumulated amortization were as follows    
Additions 971  
Transfer 1,010  
Amortization (91)  
Net book value 1,890  
Customer relationships | Cost    
Changes in cost and accumulated amortization were as follows    
Net book value 1,981  
Customer relationships | Accumulated amortization    
Changes in cost and accumulated amortization were as follows    
Net book value (91)  
Goodwill    
Changes in cost and accumulated amortization were as follows    
Additions 26,184  
Transfer (2,498)  
Net book value 23,686  
Goodwill | Cost    
Changes in cost and accumulated amortization were as follows    
Net book value R$ 23,686