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Financial instruments risk, Currency risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
MXN ($)
$ / $
Dec. 31, 2016
MXN ($)
$ / $
Apr. 20, 2018
$ / $
Currency Risk [Member]      
Currency risk [Abstract]      
Foreign exchange rate | $ / $ 19.7354 20.6640  
Currency Risk [Member] | Minimum [Member]      
Currency risk [Abstract]      
Assumed variance on foreign exchange rate (4.73%) (19.70%)  
Currency Risk [Member] | Maximum [Member]      
Currency risk [Abstract]      
Assumed variance on foreign exchange rate 4.73% 19.70%  
Currency Risk [Member] | Subsequent Event [Member]      
Currency risk [Abstract]      
Foreign exchange rate | $ / $     18.2819
Currency Risk [Member] | US [Member]      
Currency risk [Abstract]      
Percentage of sales denominated in US dollars 75.00% 75.00%  
Percentage of costs and expenses denominated in US dollars 25.00% 25.00%  
Assets $ 548,919 $ 1,217,594  
Liabilities (828,367) (1,177,029)  
Total assets (liabilities) (279,448) 40,565  
Currency Risk [Member] | Other Currencies [Member]      
Currency risk [Abstract]      
Assets 1,120 1,728  
Liabilities (134,547) (151,080)  
Total assets (liabilities) (133,427) (149,352)  
4.73% Increase in the Exchange Rate [Member]      
Currency risk [Abstract]      
Total assets (liabilities) (19,547)    
4.73% Increase in the Exchange Rate [Member] | US [Member]      
Currency risk [Abstract]      
Assets 25,989    
Liabilities (39,219)    
4.73% Increase in the Exchange Rate [Member] | Other Currencies [Member]      
Currency risk [Abstract]      
Assets 53    
Liabilities (6,370)    
4.73% Decrease in the Exchange Rate [Member]      
Currency risk [Abstract]      
Total assets (liabilities) 19,547    
4.73% Decrease in the Exchange Rate [Member] | US [Member]      
Currency risk [Abstract]      
Assets (25,989)    
Liabilities 39,219    
4.73% Decrease in the Exchange Rate [Member] | Other Currencies [Member]      
Currency risk [Abstract]      
Assets (53)    
Liabilities $ 6,370    
19.70% Increase in the Exchange Rate [Member]      
Currency risk [Abstract]      
Total assets (liabilities)   (21,427)  
19.70% Increase in the Exchange Rate [Member] | US [Member]      
Currency risk [Abstract]      
Assets   239,821  
Liabilities   (231,831)  
19.70% Increase in the Exchange Rate [Member] | Other Currencies [Member]      
Currency risk [Abstract]      
Assets   340  
Liabilities   (29,757)  
19.70% Decrease in the Exchange Rate [Member]      
Currency risk [Abstract]      
Total assets (liabilities)   (21,427)  
19.70% Decrease in the Exchange Rate [Member] | US [Member]      
Currency risk [Abstract]      
Assets   (239,821)  
Liabilities   231,831  
19.70% Decrease in the Exchange Rate [Member] | Other Currencies [Member]      
Currency risk [Abstract]      
Assets   (340)  
Liabilities   $ 29,757