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Group structure - Summary of the Net Assets Acquired, the Goodwill (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Aug. 10, 2017
Dec. 31, 2018
Dec. 31, 2017
Analysis of cash flows on acquisition [abstract]      
Net of cash flow on acquisition (investing activities)   R$ 10,413 R$ 404,631
Rico Corretora de Ttulos e Valores Mobilirios SA [member]      
Assets [abstract]      
Cash R$ 96    
Accounts receivable 1,915    
Other assets 11,582    
Deferred tax assets 3,751    
Property and equipment (Note 13 (a)) 1,728    
Intangible assets (Note 13 (b)) 75,813    
Assets acquired as of acquisition date 471,745    
Liabilities [abstract]      
Social and statutory obligations (560)    
Tax and social security obligations (12,651)    
Securities trading and intermediation (322,371)    
Provisions and contingent liabilities (Note 25) (7,921)    
Other liabilities (5,217)    
Liabilities assumed as of acquisition date (348,720)    
Total identifiable net assets at fair value 123,025    
Goodwill arising on acquisition (Note 13 (b)) 281,702    
Purchase consideration transferred 404,727    
Analysis of cash flows on acquisition [abstract]      
Consideration paid in cash 404,727    
Net cash acquired with the subsidiary (96)    
Net of cash flow on acquisition (investing activities) 404,631    
Rico Corretora de Ttulos e Valores Mobilirios SA [member] | Financial assets at fair value through profit or loss, category [member]      
Assets [abstract]      
Financial instruments 356,648    
Rico Corretora de Ttulos e Valores Mobilirios SA [member] | Financial assets at fair value through other comprehensive income, category [member]      
Assets [abstract]      
Financial instruments R$ 20,212