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Capital Stock and Long-term Retention Plan - Long-Term Retention Plan (Details) EquityInstruments in Thousands, $ in Thousands, shares in Millions |  | 3 Months Ended | 12 Months Ended |  |
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Apr. 02, 2013 | Dec. 31, 2020 MXN ($) EquityInstruments | Sep. 30, 2020 MXN ($) | Dec. 31, 2019 EquityInstruments MXN ($) | Dec. 31, 2020 EquityInstruments $ / shares | Dec. 31, 2019 EquityInstruments | Dec. 31, 2018 EquityInstruments | Dec. 31, 2020 MXN ($) | Dec. 31, 2020 shares | Jun. 30, 2020 shares
Long-Term Retention Plan |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Maximum percentage of capital granted annually in CPOs | 1.50% |  |  |  |  |  |  |  |  |
Shares sold in open market |  |  |  |  |  |  |  |  | 10.0 |
Shares vested | $ |  |  |  | 4,745,300 |  |  |  |  |  |
Cash contributions to the trust held for Long-Term Retention Plan | $ |  | $ 197,000 |  |  |  |  |  |  |  |
Number of other equity instruments forfeited in share-based payment arrangement | $ |  |  |  | 9,490,500 |  |  |  |  |  |
Number of shares held in connection of with cancellation of shares |  |  |  |  |  |  |  |  |  | 5,526.3
Number of shares held in connection of with forfeited rights |  |  |  |  |  |  |  |  | 3,196.1 | 1,009.7
Refund for decrease to the balance of shares repurchased | $ |  |  | $ 100,000 |  |  |  |  |  |  |
Funding made for acquisition of shares | $ |  | $ 197,000 |  |  |  |  |  |  |  |
Retention Plan Trust |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Percentage of CPOs or its equivalents held in the form of CPO by trust |  |  |  |  | 76.50% |  |  |  |  |
Percentage of CPOs or its equivalents held in the form other than CPO by trust |  |  |  |  | 23.50% |  |  |  |  |
Number reserved for future vesting |  |  |  |  |  |  |  |  | 137.0 |
Vesting price (in pesos per CPO) | $ / shares |  |  |  |  | $ 36.52 |  |  |  |  |
Number of CPOs owned by trust for employees |  |  |  |  |  |  |  |  | 0.8 |
Series "A" Shares | Long-Term Retention Plan |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Number of shares held in connection of with cancellation of shares |  |  |  |  |  |  |  |  |  | 666.9
Number of shares held in connection of with forfeited rights |  |  |  |  |  |  |  |  | 351.0 |
CPOs | Long-Term Retention Plan |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Shares outstanding | EquityInstruments |  | 160,365 |  | 243,472 | 160,365 | 243,472 | 179,051 |  |  |
Shares vested | EquityInstruments |  |  |  |  |  | 3,107 |  |  |  |
Number of other equity instruments forfeited in share-based payment arrangement | EquityInstruments |  |  |  |  | 122,307 | 5,030 |  |  |  |
Number of other equity instruments held in connection of with cancellation of shares |  |  |  |  |  |  |  |  |  | 47.2
Number of other equity instruments held in connection of with forfeited rights |  |  |  |  |  |  |  |  | 27.4 | 8.6
CPOs | Retention Plan Trust |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Shares outstanding |  | 223,400 |  |  | 223,400 |  |  | 223,400 |  |
Shares vested | EquityInstruments |  |  |  |  | 4,400 | 32,300 | 34,300 |  |  |
Minimum | Long-Term Retention Plan |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 2 years |  |  |  |  |  |
Minimum | Retention Plan Trust |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Vesting price (in pesos per CPO) | $ / shares |  |  |  |  | $ 52.05 |  |  |  |  |
Maximum | Long-Term Retention Plan |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term |  |  |  | 3 years |  |  |  |  |  |
Maximum | Retention Plan Trust |  |  |  |  |  |  |  |  |  |
Share based payment arrangements |  |  |  |  |  |  |  |  |  |
Vesting price (in pesos per CPO) | $ / shares |  |  |  |  | $ 1.60 |  |  |  |  |

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