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Stockholders' equity - Summary of Cost of Shares Purchased and Average Cost of Treasury Shares and Market Price (Detail) - R$ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Ordinary shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Market price per share | R$ 19.09 | R$ 27.93
Preference shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Average cost | 21.76 | 21.76
Market price per share | R$ 20.95 | R$ 31.63

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- Details
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