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Finance income and cost (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Analysis of finance income        
Interest on cash and equivalents   $ 93,122 $ 201,191 $ 152,437
Interest on asset backed trust notes   6,342 6,525  
Interest on recovery of guarantee deposits   2,047 83 166
Total finance income $ 5,089 101,511 207,799 152,603
Analysis of finance cost        
Leases financial cost   2,350,250 2,128,162 1,755,978
Financial instruments loss   448,559    
Interest on asset backed trust notes   116,240 80,314  
Cost of letter credit notes   73,141 49,856 57,277
Interest on debts and borrowings   16,368 1,660 56,916
Bank fees and others   3,707 3,607 6,141
Other finance costs   10,219 6,230  
Total finance costs $ 151,313 3,018,484 2,269,829 1,876,312
Capitalized borrowing costs        
Interest on debts and borrowings   400,406 457,973 414,836
Capitalized interest   (384,038) (456,313) (357,920)
Interest on debts and borrowing in the consolidated statements of operations   $ 16,368 $ 1,660 $ 56,916