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Property and equipment (Details 2) (Detail) - BRL (R$)
R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in cost and accumulated depreciation were as follows      
Purchases   R$ 7,873  
Acquisition of subsidiary   271  
Additions R$ 976    
Depreciation (800) (1,812)  
Net book value 11,065 10,889 R$ 4,558
Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 17,583 16,607 8,464
Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (6,518) (5,718) (3,906)
Data processing equipment      
Changes in cost and accumulated depreciation were as follows      
Purchases   3,316  
Acquisition of subsidiary   134  
Additions 238    
Depreciation (533) (1,422)  
Net book value 5,615 5,910 3,882
Data processing equipment | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 11,262 11,024 7,574
Data processing equipment | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (5,647) (5,114) (3,692)
Facilities      
Changes in cost and accumulated depreciation were as follows      
Purchases   1  
Depreciation (1) (4)  
Net book value 29 30 33
Facilities | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 53 53 52
Facilities | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (24) (23) (19)
Machinery and equipment      
Changes in cost and accumulated depreciation were as follows      
Purchases   4,171  
Acquisition of subsidiary   19  
Additions 731    
Depreciation (237) (304)  
Net book value 4,788 4,294 408
Machinery and equipment | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 5,469 4,738 548
Machinery and equipment | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (681) (444) (140)
Furniture and fittings      
Changes in cost and accumulated depreciation were as follows      
Purchases   176  
Acquisition of subsidiary   31  
Depreciation (10) (26)  
Net book value 321 331 150
Furniture and fittings | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 397 397 190
Furniture and fittings | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (76) (66) (40)
Leasehold improvements      
Changes in cost and accumulated depreciation were as follows      
Purchases   94  
Acquisition of subsidiary   69  
Depreciation (10) (14)  
Net book value 224 234 85
Leasehold improvements | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 263 263 100
Leasehold improvements | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value (39) (29) R$ (15)
Vehicles      
Changes in cost and accumulated depreciation were as follows      
Purchases   114  
Acquisition of subsidiary   18  
Additions 7    
Depreciation (9) (42)  
Net book value 88 90  
Vehicles | Cost      
Changes in cost and accumulated depreciation were as follows      
Net book value 139 132  
Vehicles | Accumulated amortization      
Changes in cost and accumulated depreciation were as follows      
Net book value R$ (51) R$ (42)