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Transactions with Related Parties - Compensation (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Transactions with related parties
Defined benefit obligation	$ 2,419,153	$ 2,514,235
Service cost	132,055	125,952
Directors, alternate directors and officers
Transactions with related parties
Key management compensation	892,769	832,905	$ 750,208
Defined benefit obligation	164,018	177,864	173,020
Cumulative contributions made by the Group to the pension and seniority premium plans on behalf of these directors and officers	115,467	140,958	$ 144,517
Officers | Cable
Transactions with related parties
Defined benefit obligation	807,031	504,230
Deferred compensation plan term			5 years
Service cost	$ 302,801	$ 340,202	$ 164,028

X

- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

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- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

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The amount of liabilities settled on behalf of the entity by a related party in related party transactions. [Refer: Related parties [member]]

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- Definition

Term of deferred compensation plan, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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