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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, 2019
Dec. 31, 2018
Disclosure of contingent liabilities [abstract]    
Beginning balance $ 40,281,573 $ 51,079,131
Business combination 1,378,611 7,812
Effect of translation (2,302,058) (5,729,826)
Increase of the year 6,410,975 15,683,252
Applications payments (5,483,327) (6,203,329)
Applications reversals (1,833,518) (14,555,467)
Reclassification by adoption of IFRIC 23 (4,072,287)  
Ending balance $ 34,379,969 $ 40,281,573