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Investments in Financial Instruments - Additional Information (Details) $ / shares in Units, shares in Thousands, $ in Thousands, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 29, 2020 $ / shares shares | Dec. 28, 2020 | Mar. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 MXN ($) | Mar. 31, 2020 MXN ($) | Nov. 30, 2019 USD ($) | Nov. 30, 2019 MXN ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 MXN ($) | Jan. 31, 2017 | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) shares | Dec. 31, 2018 MXN ($)
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per warrant | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised warrants shares | shares | 4,590,953 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,590,953 |
Proportion of warrants exercisable for common stock | 35.90% |  |  |  |  |  |  |  |  |  |  |  |  | 35.90% | 35.90% |
Notional Amount |  |  |  |  | $ 123,877,278 |  |  |  |  |  |  |  |  | $ 123,877,278 |  |
Decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,259,764 | $ (180,114) | $ 943,389
Impairment loss on Group's investment in shares of UHI |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,455,356 |  |
Fair value amount of Open ended fund |  |  |  | $ 153.7 | $ 3,155,643 | $ 153.7 | $ 3,155,643 |  | $ 121.6 | $ 2,301,682 | $ 121.6 | $ 2,301,682 |  |  |  |
Equity stake percentage |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
Increase in equity stake percentage |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |
Authorized aggregate foreign ownership of associate |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
UHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss on Group's investment in shares of UHI |  |  | $ 5,455,356 |  |  |  |  |  |  |  |  |  |  | $ 5,455,356 |  |
Ownership interest in associate |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  | 35.90% | 10.00% |
Warrants issued by UHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss, net of tax |  |  |  |  |  |  |  | $ 21,937,152 |  |  |  |  |  |  |  |
Tax amount on decline in estimated fair value of the Group's investment accounted for in other comprehensive income or loss |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,581,146 |  |

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