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Equity - Summary of Capital Stock (Detail) - shares shares in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of classes of share capital [line items] |  |  |
Capital stock | 2,100,832 | 2,100,832 | 2,072,922
Series A shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 992,078 | 992,078 | 992,078
Series D share [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 583,546 | 583,546 | 583,546
Series L share [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Capital stock | 525,208 | 525,208 | 497,298

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