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Investments - Percentage of the Company's Equity Interest (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018 MW
UFV Janauba Geracao de Energia Eletrica Distribuida [member]
Disclosure of detailed information about investment property [line items]
Photovoltaic generation plant	5

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

Generation plant capacity.

+ References

No definition available.

+ Details

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- Details

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