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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
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Preference shares [member] | Dividend distribution [Member] |  |  |
Disclosure of Dividends [Line Items] |  |  |
Dividend percentage of net income | 50.00% | 50.00% | 50.00%

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- Definition Disclosure of dividends. + References No definition available. + Details
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- Definition Dividend percentage of net income. + References No definition available. + Details
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- Details
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- Details
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