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Significant Accounting Policies - Summary of Group's Right Of Use Assets And Lease Liabilities (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of quantitative information about right-of-use assets [line items]      
Payment of leases R$ (38,023) R$ (14,296) R$ (12,983)
IFRS 16 [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Beginning Balance 40,935 40,935  
Additions to right-of-use assets 113,715    
Depreciation expense, right-of-use assets (27,383)    
Disposals, Right-of-use assets (817)    
Ending Balance 126,450 40,935 40,935
Beginning Balance 40,935    
Additions of Lease liabilities 113,715    
Interest expense, Lease liabilities 4,904    
Payment of leases (35,430)    
Disposals, Lease liabilities (863)    
Ending Balance 123,261 40,935  
Office [Member] | IFRS 16 [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Beginning Balance 35,213 35,213  
Additions to right-of-use assets 69,856    
Depreciation expense, right-of-use assets (18,343)    
Disposals, Right-of-use assets (134)    
Ending Balance 86,592 35,213 35,213
Vehicles [member] | IFRS 16 [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Beginning Balance 5,722 5,722  
Additions to right-of-use assets 6,346    
Depreciation expense, right-of-use assets (4,872)    
Disposals, Right-of-use assets (683)    
Ending Balance 6,513 R$ 5,722 R$ 5,722
Software [member] | IFRS 16 [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Additions to right-of-use assets 37,513    
Depreciation expense, right-of-use assets (4,168)    
Ending Balance R$ 33,345