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Shareholders' Equity - Disclosure of Share Capital (Detail) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class B treasury shares [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Weighted average number of treasury shares B | 13,070 | 14,415 | 9,841
Subsidiaries [member] |  |  |
Disclosure of treasury shares [line items] |  |  |
Weighted average number of treasury shares B | 56,467 | 60,129 | 38,490

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- Details
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