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Stockholders' Equity - Summary of Common Stock (Parenthetical) (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Classes of Share Capital [Line Items]
Fixed portion of shares issued	13,068,000,000	13,068,000,000
Variable portion of shares issued	41,048,938,902	39,845,721,822
Series A [Member]
Disclosure of Classes of Share Capital [Line Items]
Percentage of capital stock	64.00%
Series B [Member]
Disclosure of Classes of Share Capital [Line Items]
Percentage of capital stock	36.00%

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- Definition

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