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Financial instruments and risk management - Interest rate risk (Details)
$ in Thousands, item in Millions
12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
item
Dec. 31, 2015
MXN ($)
Interest rate risk      
Derivative financial liabilities   $ 14,144  
Loss on cash flow hedges $ 52,097 $ 353,943 $ 287,550
Interest rate swap contracts      
Interest rate risk      
Notional amount (in USD) | item   70  
Derivative financial liabilities   $ 14,144  
Loss on cash flow hedges $ 13,827 $ 48,777 $ 46,545