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Income Tax - Summary Of Temporary Difference, Unused Tax Losses And Unused Tax Credits (Detail) - BRL (R$)
R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) R$ 261,512 R$ 160,202 R$ 279,401 R$ 140,400 R$ 219,668 R$ 171,074
Deferred tax expense (income) (17,890) 19,802 139,001 (79,268) 48,594  
Deferred tax assets 261,512   284,533 152,425    
Deferred tax liabilities     (5,132) (12,025)    
Tax Losses Carry forwards [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 39,298   17,146 55,358    
Deferred tax expense (income) 22,152 (29,611) (38,212) 37,774 17,584  
Goodwill on Business Combinations [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 14,714   22,303 59,993    
Deferred tax expense (income) (7,589) (9,068) (37,690) (56,789) (51,327)  
Provisions for IFAs Commissions [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 64,669   68,041 31,031    
Deferred tax expense (income) (3,372)   37,010 4,744 26,156  
Revaluations of Financial Assets at Fair Value [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) (26,370)   25,259 1,397    
Deferred tax expense (income) (51,629) (2,486) 23,862 (2,427) 4,030  
Expected Credit Losses [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 13,695   5,666 3,079    
Deferred tax expense (income) 8,029 (75) 2,587 (2,345) 4,329  
Financial Instruments Taxed on Redemption [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset)       (13,041)    
Deferred tax expense (income)   9,852 13,041 (6,230) (6,811)  
Profit Sharing Plan [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 71,309   141,136      
Deferred tax expense (income) (69,828) 51,494 141,136      
Net Gain on Hedge Instruments [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 22,706   (36,384) (1,441)    
Deferred tax expense (income) 59,091 (1,080) (34,943) (51,423) 49,382  
ShareBase Compensation [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 14,187   2,950      
Deferred tax expense (income) 11,237   2,950      
Other provisions [member]            
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]            
Deferred tax liability (asset) 47,304   33,284 4,024    
Deferred tax expense (income) R$ 14,019 R$ 776 R$ 29,260 R$ (2,572) R$ 5,251