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Intangible assets - Summary of Intangible Assets (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance R$ 307,657 R$ 234,088
Business combination   62,789
Additions 67,040 23,345
Disposals (998) (7,801)
Impairment   (4,764)
Intangible assets ending balance 373,699 307,657
Cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 381,779 282,373
Business combination   62,794
Additions 104,687 49,177
Disposals (26,006) (7,801)
Impairment   (4,764)
Intangible assets ending balance 460,460 381,779
Cost [member] | Goodwill [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 143,194 118,706
Business combination   24,488
Intangible assets ending balance 143,194 143,194
Cost [member] | Customer relationship [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 99,428 97,355
Business combination   2,103
Disposals (60) (30)
Intangible assets ending balance 99,368 99,428
Cost [member] | Trademark use right [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 12,491 12,491
Intangible assets ending balance 12,491 12,491
Cost [member] | Trademarks and patents [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 1,704 45
Business combination   1,659
Additions 28  
Intangible assets ending balance 1,732 1,704
Cost [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 95,683 43,063
Business combination   34,544
Additions 41,363 22,840
Disposals (25,000)  
Transfers 22,566  
Impairment   (4,764)
Intangible assets ending balance 134,612 95,683
Cost [member] | Licenses for use - payment arrangements [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 11,437 5,527
Additions 88 5,910
Disposals (7)  
Intangible assets ending balance 11,518 11,437
Cost [member] | Software in progress [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 17,116 4,486
Additions 25,695 19,701
Disposals (213) (7,071)
Transfers (22,566)  
Intangible assets ending balance 20,032 17,116
Cost [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 726 700
Additions   726
Disposals (726) (700)
Intangible assets ending balance   726
Cost [member] | Right Of Use Assets Software Member [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets ending balance 37,513  
Accumulated Amortization [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 74,122 48,285
Business combination   5
Additions 37,647 25,832
Disposals (25,008)  
Intangible assets ending balance 86,761 74,122
Accumulated Amortization [member] | Customer relationship [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 26,571 16,811
Additions 10,582 9,760
Disposals (60)  
Intangible assets ending balance 37,093 26,571
Accumulated Amortization [member] | Trademark use right [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 12,491 12,491
Intangible assets ending balance 12,491 12,491
Accumulated Amortization [member] | Trademarks and patents [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 113  
Additions (335) (113)
Intangible assets ending balance 448 113
Accumulated Amortization [member] | Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 30,346 17,030
Business combination   5
Additions 19,847 13,311
Disposals (23,678)  
Intangible assets ending balance 26,515 30,346
Accumulated Amortization [member] | Licenses for use - payment arrangements [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 3,514 1,236
Additions 2,533 2,278
Disposals (1)  
Intangible assets ending balance 6,046 3,514
Accumulated Amortization [member] | Other intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets beginning balance 1,087 717
Additions (182) (370)
Disposals (1,269)  
Intangible assets ending balance   R$ 1,087
Accumulated Amortization [member] | Right Of Use Assets Software Member [Member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets ending balance R$ 4,168