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Accounting policies - Schedule of Exchange Rates of Real for Functional Currencies of Subsidiaries (Detail) - R$ / shares | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
United States dollar (U.S.$) [member] |  |  |
Disclosure of foreign exchange rates [line items] |  |  |
Foreign currency exchange rate | 5.581 | 5.197 | 4.031
British pound (GBP) [member] |  |  |
Disclosure of foreign exchange rates [line items] |  |  |
Foreign currency exchange rate | 7.524 | 7.101 | 5.325
Euro Member Countries, Euro |  |  |
Disclosure of foreign exchange rates [line items] |  |  |
Foreign currency exchange rate | 6.321 | 6.378 | 4.531

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