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Description of the business and summary of significant accounting policies - Employee benefits (Details)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Share-based payments        
Termination benefits provision   $ 0 $ 0 $ 0
Number of days' wages for each year of service provided as seniority premium benefits 12 days 12 days    
Minimum years of service to receive seniority premium benefits 15 years 15 years    
Salaries and benefits $ 143,075 $ 2,823,647 2,419,537 1,902,748
Quarterly incentive bonuses        
Share-based payments        
Salaries and benefits   48,384 40,829 50,558
Short-term benefit plan for certain key personnel        
Share-based payments        
Salaries and benefits   0 53,738 70,690
Restricted Stock Units        
Share-based payments        
Salaries and benefits   13,508 7,816 6,018
SARs - cash settled        
Share-based payments        
Salaries and benefits     31,743 44,699
Salaries and benefits   (8,999)    
MIP I        
Share-based payments        
Salaries and benefits       327
MIP II        
Share-based payments        
Salaries and benefits     54,357  
Salaries and benefits   (16,499)    
Employee profit sharing        
Share-based payments        
Salaries and benefits   $ 8,342 $ 9,967 $ 9,938