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Share-based payment - Summary of Changes in Share-based Compensation Plan (Detail) | 12 Months Ended
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Dec. 31, 2019 R$ / shares | Dec. 31, 2018 R$ / shares
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Number of outstanding share options, beginning balance | 3,089,599 | 24,514,359
Options vested at the end of the period | 3,089,599 | 24,514,359
Options vested at the end of the period | R$ 22.11 | R$ 25.21
Delivered | (15,627,167) | (11,597,420)
Canceled / Forfeited | (72,318) | (352,085)
Exercised | (3,017,281) | (21,072,675)
Closing balance | 0 | 3,089,599
Options vested at the end of the period | 0 | 3,089,599
Opening balance | R$ 22.11 | R$ 25.21
Options vested at the end of the period | 0 | 22.11
Canceled / Forfeited (*) | 24.36 | 29.29
Exercised | 22.68 | 28.26
Closing balance | 0 | 22.11
Market value weighted average | 36.34 | 33.98
Range of exercise prices granting 2010 - 2011 [Member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Granting | R$ 22.95 |
Range of exercise prices granting 2010 - 2011 [Member] | Bottom of range [member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Granting |  | 14.47
Range of exercise prices granting 2010 - 2011 [Member] | Top of range [member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Granting |  | R$ 29.51
Range of exercise prices granting 2012 [Member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Weighted average of remaining contractual life (years) |  | 11 months 26 days
Variable compensation [Member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Number of outstanding share options, beginning balance | 25,016,145 | 31,229,973
New | 9,794,250 | 10,552,225
Delivered | (14,237,280) | (16,611,521)
Cancelled | (352,181) | (154,532)
Closing balance | 20,220,934 | 25,016,145
Market value weighted average | R$ 37.55 | R$ 34.04
Partner plan [member] |  |
Disclosure Of Share Based Compensation Plans [Line Items] |  |
Number of outstanding share options, beginning balance | 48,871,182 | 51,074,441
New | 8,096,700 | 9,912,356
Cancelled | (2,035,504) | (518,195)
Closing balance | 39,305,211 | 48,871,182
Weighted average of remaining contractual life (years) | 1 year 7 months 2 days | 2 years 6 months 7 days
Market value weighted average | R$ 25.49 | R$ 26.22

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