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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 ($)
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
MXN ($)
$ / shares
shares
Dec. 31, 2019
MXN ($)
$ / shares
shares
Dec. 31, 2018
MXN ($)
$ / shares
shares
Dec. 31, 2020
MXN ($)
Equity            
Net (loss) income for the period   $ (215,242) $ (4,293,791) $ 2,639,063 $ (942,882)  
Weighted average number of shares outstanding (in thousands):            
Basic   1,021,561 1,021,561 1,011,877 1,011,877  
Diluted   1,021,561 1,021,561 1,011,877 1,011,877  
EPS- LPS :            
Basic | (per share)   $ (0.211) $ (4.203) $ 2.608 $ (0.932)  
Diluted | (per share)   $ (0.211) $ (4.203) $ 2.608 $ (0.932)  
Legal reserve   $ 14,596   $ 291,178 $ 291,178 $ 291,178
Legal reserve as a percent of capital stock   8.50%   9.80% 9.80% 8.50%
Amount allocated to legal reserve | $ $ 252,928          
Withholding tax on dividends distributions (as a percent)   10.00% 10.00%