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Income taxes (Schedule of Tax Losses Pending of Amortize) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax losses available $ 10,631,235
2011 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2021
Tax losses available $ 7,832,672 [1]
2012 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2022
Tax losses available $ 13
2013 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2023
Tax losses available $ 4,944
2014 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2024
Tax losses available $ 14,231
2015 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2025
Tax losses available $ 8,395
2016 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2026
Tax losses available $ 356,102
2017 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2027
Tax losses available $ 348,058
2018 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2028
Tax losses available $ 100,674
2018 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2029
Tax losses available $ 1,119,822
2020 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2030
Tax losses available $ 846,324
[1] This amount includes $ 7,832,647 corresponding to a tax loss from the sale of shares which, according to the Income Tax Law, can only be applied against taxable profits on the sale of shares generated in the future