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Income taxes (Schedule of Tax Losses Pending of Amortize) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
MXN ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Tax losses available $ 10,772,446
2010 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2020
Tax losses available $ 18,568
2011 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2021
Tax losses available $ 9,050,488 [1]
2012 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2022
Tax losses available $ 46
2013 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2023
Tax losses available $ 81,169
2014 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2024
Tax losses available $ 38,287
2015 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2025
Tax losses available $ 38,213
2016 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2026
Tax losses available $ 239,593
2017 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2027
Tax losses available $ 721,839
2018 [Member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Expiration Date 2028
Tax losses available $ 584,243
[1] This amount includes $ 9,014,364 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.