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Financial assets and liabilities - Short-term and long-term debt (Details)
$ in Thousands, $ in Thousands
 12 Months Ended 36 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2015
MXN ($)
Short-term and long-term debt            
Accrued interest   $ 5,972 $ 6,102   $ 16,364  
Total financial debt   3,482,714 1,994,283   3,523,198 $ 1,591,019
Less: Short-term maturities $ 61,590 2,403,562 1,051,237 $ 61,590 1,212,259 1,371,202
Long-term $ 117,409 1,079,152 943,046 $ 117,409 2,310,939 $ 219,817
Within one year            
Short-term and long-term debt            
Total financial debt         1,212,259  
Between one year and two years            
Short-term and long-term debt            
Total financial debt         1,508,757  
Between two and three years            
Short-term and long-term debt            
Total financial debt         777,095  
Between three and four years            
Short-term and long-term debt            
Total financial debt         25,087  
Revolving line of credit            
Short-term and long-term debt            
Financial debt excluding accrued interest   $ 2,528,388 $ 1,271,891   3,045,574  
Total financial debt         $ 3,059,804  
Interest rate basis three-month LIBOR plus a spread of 260 basis points three-month LIBOR plus a spread of 260 basis points three-month LIBOR plus a spread of 260 basis points      
Spread on interest rate basis 2.60% 2.60% 2.60% 2.60% 2.60%  
Revolving line of credit | Within one year            
Short-term and long-term debt            
Total financial debt         $ 748,865  
Revolving line of credit | Between one year and two years            
Short-term and long-term debt            
Total financial debt         1,508,757  
Revolving line of credit | Between two and three years            
Short-term and long-term debt            
Total financial debt         777,095  
Revolving line of credit | Between three and four years            
Short-term and long-term debt            
Total financial debt         25,087  
Short-term working capital facility with Citibanamex            
Short-term and long-term debt            
Financial debt excluding accrued interest   $ 948,354 $ 406,330   461,260  
Total financial debt         $ 463,394  
Interest rate basis       TIIE 28 days plus a 90 basis points    
Spread on interest rate basis 0.90% 0.90% 0.90% 0.90% 0.90%  
Short-term working capital facility with Citibanamex | Within one year            
Short-term and long-term debt            
Total financial debt         $ 463,394  
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 plus 160 basis points      
Spread on interest rate basis     1.60%