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Equity - Earnings (loss) per share (Details)
$ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Apr. 19, 2017
MXN ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
MXN ($)
$ / shares
shares
Dec. 31, 2018
MXN ($)
$ / shares
shares
Dec. 31, 2017
MXN ($)
$ / shares
shares
Dec. 31, 2019
MXN ($)
Equity            
Net income (loss) for the year   $ 140,039 $ 2,639,063 $ (942,882) $ 278,671  
Weighted average number of shares outstanding (in thousands):            
Basic   1,011,877 1,011,877 1,011,877 1,011,877  
Diluted   1,011,877 1,011,877 1,011,877 1,011,877  
EPS- LPS :            
Basic | (per share)   $ 0.138 $ 2.608 $ (0.932) $ 0.275  
Diluted | (per share)   $ 0.138 $ 2.608 $ (0.932) $ 0.275  
Legal reserve   $ 15,451   $ 291,178 $ 291,178 $ 291,178
Legal reserve as a percent of capital stock   9.80%   9.80% 9.80% 9.80%
Amount allocated to legal reserve | $ $ 252,928          
Withholding tax on dividends distributions (as a percent)   10.00% 10.00%