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Income tax - Analysis of income tax expense (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Income tax        
Current year income tax expense   $ (51,313) $ (706,244) $ (337,997)
Deferred income tax benefit (expense)   212,488 (750,938) (700,351)
Total income tax benefit (expense) $ 8,167 161,175 (1,457,182) (1,038,348)
Deferred income tax expense, translation effect   1,008 1,242  
Deferred tax related to items recognized in OCI during the year        
Net gain (loss) on cash flow hedges   12,017 (187,408) 58,161
Remeasurement gain of employee benefits   533 132 352
Deferred tax charged to OCI   $ 12,550 $ (187,276) $ 58,513