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Financial Assets and Liabilities - Summary of changes in liabilities arising from financing activities (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Beginning balance $ 707,801,403 $ 683,216,744
Cash flow (27,433,489) (61,390,813)
Foreing currency exchange and other 17,516,985 85,975,472
Ending balance $ 697,884,899 $ 707,801,403