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Income tax - Analysis of income tax expense (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Income tax        
Current year income tax expense   $ (232,824) $ (51,313) $ (706,244)
Deferred income tax benefit (expense)   471,060 212,488 (750,938)
Total income tax benefit (expense) $ 12,104 238,236 161,175 (1,457,182)
Deferred income tax expense, translation effect   2,683 1,008 1,242
Deferred tax related to items recognized in OCI during the year        
Net gain (loss) on cash flow hedges   85,107 12,017 (187,408)
Remeasurement (loss) gain of employee benefits   (1,797) 533 132
Deferred tax charged to OCI   $ 83,310 $ 12,550 $ (187,276)