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Basis of preparation and presentation of the financial statements (Schedule of Relevant Exchange Rates Used) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Apr. 09, 2019
Disclosure of subsidiaries [line items]
Current exchange rate as of (Mexican pesos per one U.S. dollar)		19.66	19.74
Average exchange rate for the year ended December 31 (Mexican pesos per one U.S. dollar)	[1]	19.23	18.94
Non-adjusting events after reporting period [member]
Disclosure of subsidiaries [line items]
Current exchange rate as of (Mexican pesos per one U.S. dollar)				18.97
[1] Average exchange rate used to translate revenues, costs and expenses of the companies mentioned above.

X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

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- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

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