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Other accounts receivable, net - Aging of accounts receivable (Details)
$ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2014
MXN ($)
Accounts receivable aging          
Impaired accounts receivable   $ 17,809 $ 19,317 $ 24,612 $ 27,786
Not impaired accounts receivable $ 24,244 478,467 427,403    
Total accounts receivable   496,276 446,720    
0-30 Days          
Accounts receivable aging          
Impaired accounts receivable   16,962 15,723    
Not impaired accounts receivable   415,847 398,721    
Total accounts receivable   432,809 414,444    
31-60 Days          
Accounts receivable aging          
Not impaired accounts receivable   38,705 11,231    
Total accounts receivable   38,705 11,231    
61-90 Days          
Accounts receivable aging          
Not impaired accounts receivable   17,918 14,492    
Total accounts receivable   17,918 14,492    
91-120 Days          
Accounts receivable aging          
Impaired accounts receivable   847 3,594    
Not impaired accounts receivable   5,997 2,959    
Total accounts receivable   $ 6,844 $ 6,553