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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - MXN ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash And Cash Equivalents [Abstract]        
Cash $ 1,616,408 $ 1,560,536 $ 1,171,725  
Investments of cash surpluses 5,855,824 3,326,662 1,824,774  
Cash equivalents designated for expenditure, held in trust 257,911 300,940    
Cash and cash equivalents $ 7,730,143 $ 5,188,138 $ 2,996,499 $ 1,595,502