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Investments in Associates and Joint Ventures - Reconciles of Summary of Financial Information (Details) $ in Thousands, $ in Thousands |  | 12 Months Ended
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Mar. 31, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
Group's interest in UHI: |  |  |  |  |  |  |
Impairment loss in investment in shares of UHI |  |  | $ (5,455,356) |  |  |  |
UHI |  |  |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |  |  |
Net income (10%) |  | $ 3,635 | 78,133 | $ 27,668 | $ 532,896 | $ 1,208 | $ 23,258
Other comprehensive (loss) income (10%) |  | $ (2,367) | (50,872) | $ (9,889) | (190,457) | $ 1,538 | 29,620
Adjustments for differences in accounting policies: |  |  |  |  |  |  |
Net (loss) income |  |  | 79,163 |  | 55,058 |  | (166,044)
Other comprehensive loss |  |  | (6,657) |  | (45,263) |  | (76,521)
Group's interest in UHI: |  |  |  |  |  |  |
Net (loss) income |  |  | (1,030) |  | 477,838 |  | 189,302
Other comprehensive loss |  |  | (57,529) |  | $ (235,720) |  | $ (46,901)
Impairment loss in investment in shares of UHI | $ (5,455,356) |  | $ (5,455,356) |  |  |  |

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