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Cash and Cash Equivalents and Temporary Investments - Cash and Cash equivalents (Details) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and Cash Equivalents and Temporary Investments        
Cash and bank accounts $ 1,761,260 $ 1,550,698    
Short-term investments 36,973,689 45,995,385    
Total cash and cash equivalents $ 38,734,949 $ 47,546,083 $ 49,397,126 $ 29,729,350