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Finance income and cost (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Analysis of finance income        
Interest on cash and equivalents   $ 152,437 $ 105,151 $ 78,793
Interest on recovery of guarantee deposits   166 644 23,792
Others       6
Total finance income $ 7,753 152,603 105,795 102,591
Analysis of finance cost        
Cost of letter credit notes   57,277 42,294 28,067
Interest on debts and borrowings   56,916 37,565 1,245
Bank fees and others   6,141 5,279 5,804
Other finance costs     1,219  
Total finance costs $ 6,114 120,334 86,357 35,116
Capitalized borrowing costs        
Interest on debts and borrowings   414,836 230,954 96,690
Capitalized interest   (357,920) (193,389) (95,445)
Interest on debts and borrowing in the consolidated statements of operations   $ 56,916 $ 37,565 $ 1,245