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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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The amount of earnings per share when the basic and diluted measurements are equal. [Refer: Basic earnings (loss) per share; Diluted earnings (loss) per share]

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The number of shares issued by the entity.

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The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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