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Income tax - Analysis of income tax expense (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Income tax        
Current year income tax expense   $ (281,491) $ (232,824) $ (51,313)
Deferred income tax (expense) benefit   (813,340) 582,644 (186,273)
Total income tax (expense) benefit $ (58,096) (1,094,831) 349,820 (237,586)
Deferred income tax expense, translation effect   (2,278) 2,680 936
Deferred tax related to items recognized in OCI during the year        
Net (loss) gain on cash flow hedges   (74,820) 85,107 12,017
Remeasurement gain (loss) of employee benefits   3,058 (1,797) 533
Deferred tax charged to OCI   $ (71,762) $ 83,310 $ 12,550