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Related parties - Analysis of balances due from/to related parties (Details) - MXN ($)
$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Disclosure of transactions between related parties      
Due to related parties $ 40,931 $ 65,022 $ 40,931
One Link, S.A. de C.V.      
Disclosure of transactions between related parties      
Due to related parties $ 24,980 $ 33,775 24,980
Term 30 days 30 days  
Aeromantenimiento, S.A.      
Disclosure of transactions between related parties      
Due to related parties $ 15,951 $ 30,627 $ 15,951
Term 30 days 30 days  
SearchForce, Inc.      
Disclosure of transactions between related parties      
Due to related parties   $ 620  
Term     30 days