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Income tax - Analysis of income tax expense (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Income tax        
Current year income tax expense   $ (90,609) $ (281,491) $ (232,824)
Deferred income tax benefit (expense)   1,496,793 (813,340) 582,644
Total income tax benefit (expense) $ 70,490 1,406,184 (1,094,831) 349,820
Deferred income tax expense, translation effect   2,035 (2,278) 2,680
Deferred tax related to items recognized in OCI during the year        
Net gain (loss) cash flow hedges   46,835 (74,820) 85,107
Remeasurement (loss) gain of employee benefits   794 3,058 (1,797)
Deferred income tax charged to OCI   $ 47,629 $ (71,762) $ 83,310