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Post-employment Benefits - Plan assets (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Post-employment benefit plans |  |
Minimum investment required (as a percent) | 30.00% |
Weighted average asset allocation (as a percent) | 100.00% | 100.00%
Fair value os plan assets held by the trust | $ 227,004 | $ 265,599
Weighted average expected long-term rate of return of plan assets | 7.60% | 6.70%
Minimum |  |
Post-employment benefit plans |  |
Term for liquidity of mutual funds | 1 day |
Maximum |  |
Post-employment benefit plans |  |
Term for liquidity of mutual funds | 1 month |
Equity securities |  |
Post-employment benefit plans |  |
Target allocation (as a percent) | 20.00% |
Weighted average asset allocation (as a percent) | 29.60% | 28.20%
Fixed rate instruments |  |
Post-employment benefit plans |  |
Target allocation (as a percent) | 80.00% |
Weighted average asset allocation (as a percent) | 70.40% | 71.80%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References No definition available. + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References No definition available. + Details
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