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Equity - Earnings per share (Details) $ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands		12 Months Ended
	Apr. 19, 2017 MXN ($)	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2018 MXN ($) $ / shares shares	Dec. 31, 2017 MXN ($) $ / shares shares	Dec. 31, 2016 MXN ($) $ / shares shares	Dec. 31, 2018 MXN ($)
Equity
Net (loss) income for the period		$ (34,674)	$ (682,500)	$ (651,788)	$ 3,478,598
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
LPS - EPS:
Basic | (per share)		$ (0.034)	$ (0.674)	$ (0.644)	$ 3.438
Diluted | (per share)		$ (0.034)	$ (0.674)	$ (0.644)	$ 3.438
Legal reserve		$ 14,794		$ 291,178	$ 38,250	$ 291,178
Legal reserve as a percent of capital stock		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%

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The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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