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Trade receivables - Net (Schedule of Age of Receivables Past Due) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [line items]    
Total $ 467,377 $ 293,214
Trade receivables [Member] | 30 - 60 days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total 221,996 72,778
Trade receivables [Member] | 61 - 90 days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total 57,119 57,629
Trade receivables [Member] | 91 + days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total $ 188,262 $ 162,807