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Equity - Schedule of Stockholders Equity Tax Account (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Contributed capital account $ 26,519,004 $ 26,540,780 $ 27,415,833
Net tax income account 4,111,601 3,232,321 2,147,169
Total $ 30,630,605 $ 29,773,101 $ 29,563,002