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Operating costs - Summary of Operating Costs (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
Disclosure Of Operating Expense [Abstract]          
Commission costs R$ 441,951 R$ 242,831 R$ 1,269,309 R$ 750,103 R$ 455,241
Operating losses and provisions 38,303 2,901 23,332 9,989 7,148
Other costs 98,562 62,024 313,419 181,154 117,491
Clearing house fees 63,504 34,513 201,083 96,896 71,419
Third parties' services 18,148 19,579 76,669 53,124 28,953
Other 16,910 7,932 35,667 31,134 17,119
Total R$ 578,816 R$ 307,756 R$ 1,606,060 R$ 941,246 R$ 579,880