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25. Earnings per share (Details) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share Details Abstract |  |  |
Equity attributable to Company's owners | R$ 2,835,068 | R$ 2,519,310 | R$ 2,947,098
Number of shares | 683,509,869 | 683,509,869 | 683,509,869
Basic and diluted earnings per share (reais per share) | R$ 4.15 | R$ 3.69 | R$ 4.31

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