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Financial Instruments - Class of Assets and Liabilities Subject to Recurring Fair Value Measurements Categorized Within Level 3 (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments
Potential Impact on Consolidated Equity Statement, Most Favourable Assumption	$ 3,639,595	$ 3,829,937
Potential Impact on Consolidated Equity Statement, Least Favourable Assumption	$ (3,639,595)	$ (3,829,937)
Non-recurring basis
Financial Instruments
Expected future cash flow time period	5 years
UHI | Recurring basis | Internal Models with Significant Unobservable Inputs (Level 3) | Warrants issued by UHI
Financial Instruments
Percentage of reasonably possible decrease in risk assumption	(10.00%)	(10.00%)
Potential Impact on Consolidated Equity Statement, Most Favourable Assumption	$ 3,639,595	$ 3,829,937
Potential Impact on Consolidated Equity Statement, Least Favourable Assumption	$ (3,639,595)	$ (3,829,937)

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The expected period for calculation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The increase (decrease) in profit and loss as a result of an increase in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

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The increase (decrease) in equity as a result of an decrease in a designated risk component that was reasonably possible at the end of the reporting period. Excludes defined benefit plan obligations.

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The reasonably possible percentage of the decrease in the designated risk component used to determine the value of the financial instrument. Excludes defined benefit plan obligations.

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