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Equity and Remuneration to Shareholders - Schedule of Dividends Proposed for Distribution to Shareholders Based on the Profit for the Business Year (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Preference shares [member] | Dividend distribution [Member]
Disclosure of Dividends [Line Items]
Dividend percentage of net income	50.00%	50.00%	50.00%

X

- Definition

Disclosure of dividends.

+ References

No definition available.

+ Details

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X

- Definition

Dividend percentage of net income.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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