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Financial assets and liabilities - Short-term and long-term debt (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2015
MXN ($)
Short-term and long-term debt        
Accrued interest   $ 6,102 $ 5,972  
Total financial debt   1,994,283 3,482,714 $ 1,591,019
Less: Short-term maturities $ 121,789 1,051,237 2,403,562 1,371,202
Long-term $ 54,681 943,046 1,079,152 $ 219,817
Within one year        
Short-term and long-term debt        
Total financial debt     2,403,562  
Between one year and two years        
Short-term and long-term debt        
Total financial debt     670,388  
Between two and three years        
Short-term and long-term debt        
Total financial debt     333,303  
Between three and four years        
Short-term and long-term debt        
Total financial debt     75,461  
Revolving line of credit        
Short-term and long-term debt        
Financial debt excluding accrued interest   $ 1,271,891 2,528,388  
Total financial debt     2,531,978  
Interest rate basis three-month LIBOR three-month LIBOR    
Revolving line of credit | Within one year        
Short-term and long-term debt        
Total financial debt     1,452,826  
Revolving line of credit | Between one year and two years        
Short-term and long-term debt        
Total financial debt     670,388  
Revolving line of credit | Between two and three years        
Short-term and long-term debt        
Total financial debt     333,303  
Revolving line of credit | Between three and four years        
Short-term and long-term debt        
Total financial debt     75,461  
Short-term working capital facility with Citibanamex        
Short-term and long-term debt        
Financial debt excluding accrued interest   $ 406,330 948,354  
Total financial debt     950,736  
Interest rate basis TIIE 28 TIIE 28    
Short-term working capital facility with Citibanamex | Within one year        
Short-term and long-term debt        
Total financial debt     $ 950,736  
Short-term working capital facility with Bank of America        
Short-term and long-term debt        
Financial debt excluding accrued interest   $ 309,960    
Interest rate basis   one-month LIBOR    
Spread on interest rate basis   1.60%    
Minimum | Revolving line of credit        
Short-term and long-term debt        
Spread on interest rate basis 1.99% 1.99% 1.99%  
Minimum | Short-term working capital facility with Citibanamex        
Short-term and long-term debt        
Spread on interest rate basis 0.20% 0.20% 0.20%  
Maximum | Revolving line of credit        
Short-term and long-term debt        
Spread on interest rate basis 2.25% 2.25% 2.25%  
Maximum | Short-term working capital facility with Citibanamex        
Short-term and long-term debt        
Spread on interest rate basis 0.80% 0.80% 0.80%