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Financial Risk Management - Summary of Ratio of the Shareholders' Equity to Total Liabilities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure Of Financial Instruments [Abstract]      
Stockholders' equity -controlling interest $ 21,028,215 $ 21,333,015 $ 21,273,951
Total liabilities $ 17,440,763 $ 13,646,893 $ 9,317,356
Ratio of total stockholders' equity to liabilities 1.2 1.6 2.3