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Accounts Payable, Accrued Liabilities and Asset Retirement Obligations - Summary of Movements in Contingent Liabilities (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of contingent liabilities [abstract]    
Beginning balance $ 51,079,131 $ 50,766,070
Business combination 7,812 115,971
Effect of translation (5,729,826) (648,685)
Increase of the year 15,683,252 10,510,473
Applications payments (6,203,329) (7,618,520)
Applications reversals (14,555,467) (2,046,178)
Ending balance $ 40,281,573 $ 51,079,131