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Financial Instruments - Schedule of Assets As Per Statement of Financial Position (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Short-term investments R$ 2,937,029 R$ 2,770,589
Accounts receivable from card issuers 14,066,814 9,244,608
Trade accounts receivable 249,417 44,616
Derivative financial instruments 14,062 1,195
Other assets 106,345 6,860
Total Assets 17,418,352 12,076,375
Financial assets at amortized cost, category [member]    
Disclosure of financial assets [line items]    
Trade accounts receivable 124,756 44,616
Other assets 151,030 15,367
Total Assets 275,786 59,983
Financial assets at fair value through profit or loss [member]    
Disclosure of financial assets [line items]    
Short-term investments 2,926,509 2,762,071
Trade accounts receivable 124,661  
Derivative financial instruments 14,062 1,195
Total Assets 3,065,232 2,763,266
Financial assets at fair value through other comprehensive income, category [member]    
Disclosure of financial assets [line items]    
Short-term investments 10,520 8,518
Accounts receivable from card issuers 14,066,814 9,244,608
Total Assets R$ 14,077,334 R$ 9,253,126