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Income taxes (Narrative) (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Effective tax rate [1] 17.92% 17.92% 37.21% 17.68%
USD [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses   $ 9,014,364    
GV do Brasil Industria e Comercio of Aco LTDA [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses   1,025,000 $ 1,025,000  
GV do Brasil Industria e Comercio of Aco LTDA [Member] | Brazil, Brazil Real [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses   $ 202,008 $ 202,008  
Mexican companies [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Effective tax rate 30.00% 30.00% 30.00% 30.00%
Description of decree issued by finance ministry As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR, to the taxpayers who had obtained income from its business activity in the last period, up to 100 million pesos. As of November 18, 2015, the Finance Ministry (SHCP) issued a decree in which a fiscal incentive is given to those who pay income tax (ISR) under terms of the Titles II or IV, Chapter II, Section I of the Law of ISR, to the taxpayers who had obtained income from its business activity in the last period, up to 100 million pesos.    
Percentage of investment of new fixed assets 69.00% 69.00% 85.00% 82.00%
Republic [Member] | USD [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses $ 240,200      
Expiration period expire between 2033 and 2038 expire between 2033 and 2038    
State and local [Member] | USD [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses $ 338,000      
Expiration period expire between 2019 and 2038 expire between 2019 and 2038    
Canada [Member] | USD [Member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Tax losses $ 4,700      
Expiration period expire between 2032 and 2037 expire between 2032 and 2037    
[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.