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Improvements to Concession Assets - Summary of Improvements to Concession Assets (Detail) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about service concession arrangements [Line Items]      
Beginning balance $ 12,063,383 $ 10,982,860 $ 9,944,022
Additions 1,535,460 1,194,803 1,033,311
Divestitures     (402)
Currency translation effect 164,997 (114,280) 5,929
Ending balance 13,763,840 12,063,383 10,982,860
Construction in-progress [Member]      
Disclosure of detailed information about service concession arrangements [Line Items]      
Beginning balance 782,005 2,382,118 2,376,483
Additions 2,153,038 1,218,757 1,661,060
Transfers (259,621) (2,804,400) (1,669,128)
Currency translation effect 9,207 (14,470) 13,703
Ending balance 2,684,629 782,005 2,382,118
Improvements to concession assets [Member]      
Disclosure of detailed information about service concession arrangements [Line Items]      
Beginning balance 16,843,096 13,441,649 11,779,768
Additions 321,758 760,726 6,366
Divestitures   (21,977) (7,919)
Transfers 259,621 2,804,400 1,669,128
Currency translation effect 202,739 (141,702) (5,694)
Ending balance 17,627,214 16,843,096 13,441,649
Total investment [Member]      
Disclosure of detailed information about service concession arrangements [Line Items]      
Beginning balance 17,625,101 15,823,767 14,156,251
Additions 2,474,796 1,979,483 1,667,426
Divestitures   (21,977) (7,919)
Currency translation effect 211,946 (156,172) 8,009
Ending balance 20,311,843 17,625,101 15,823,767
Accumulated amortization [Member]      
Disclosure of detailed information about service concession arrangements [Line Items]      
Beginning balance (5,561,718) (4,840,907) (4,212,229)
Additions (939,336) (784,680) (634,115)
Divestitures   21,977 7,517
Currency translation effect (46,949) 41,892 (2,080)
Ending balance $ (6,548,003) $ (5,561,718) $ (4,840,907)