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Trade receivables - Net (Schedule of Age of Receivables Past Due) (Details) - MXN ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets that are either past due or impaired [line items]    
Total $ 432,354 $ 936,793
Trade receivables [Member] | 30 - 60 days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total 164,646 279,048
Trade receivables [Member] | 61 - 90 days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total 22,288 121,790
Trade receivables [Member] | 91 + days [Member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Total $ 245,420 $ 535,955