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Finance income and cost (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Analysis of finance income        
Interest on cash and equivalents   $ 105,151 $ 78,793 $ 47,029
Interest on recovery of guarantee deposits   644 23,792  
Others     6 5
Total finance income $ 5,361 105,795 102,591 47,034
Analysis of finance cost        
Cost of letter credit notes   42,294 28,067 18,279
Interest on debts and borrowings   37,565 1,245  
Bank fees and others   5,279 5,804 3,424
Other finance costs   1,219    
Total finance costs $ 4,376 86,357 35,116 21,703
Capitalized borrowing costs        
Interest on debts and borrowings   230,954 96,690 90,057
Capitalized interest   (193,389) (95,445) $ (90,057)
Interest on debts and borrowing in the consolidated statements of operations   $ 37,565 $ 1,245