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Financial Risk Management - Cash Flow Interest Rate Risk (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Temporary investments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | $ 6,013,678 | $ 5,498,219
Assets at fair value | 6,013,678 | 5,498,219
Warrants issued by UHI |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | 36,395,183 | 38,298,606
Assets at fair value | 36,395,183 | 38,298,606
Long-term loan and interest receivable from GTAC |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | 929,516 | 881,740
Assets at fair value | 937,137 | 889,054
Increase (Decrease) of Fair Value Over Carrying Value of assets | 7,621 | 7,314
Held-to-maturity investments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | 287,605 | 335,833
Assets at fair value | 284,443 | 334,807
Increase (Decrease) of Fair Value Over Carrying Value of assets | (3,162) | (1,026)
Available-for-sale investments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | 7,297,577 | 6,456,392
Assets at fair value | 7,297,577 | 6,456,392
Derivative financial instruments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of assets | 2,263,874 | 647,770
Assets at fair value | 2,263,874 | 647,770
Notes due 2021 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 6,000,000 | 6,000,000
Liabilities at fair value | 6,090,900 | 5,953,980
Notes due 2022 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,000,000 | 5,000,000
Liabilities at fair value | 5,063,300 | 4,942,230
Notes due 2027 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 4,500,000 |
Liabilities at fair value | 4,442,940 |
Finance lease obligations |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,622,774 | 6,391,826
Liabilities at fair value | 5,360,933 | 5,763,903
Other notes payable |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 3,684,060 | 4,853,025
Liabilities at fair value | 3,319,414 | 4,143,984
Interest rate risk | Warrants issued by UHI |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value | 3,639,518 | 3,829,861
Interest rate risk | Long-term loan and interest receivable from GTAC |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value | 101,335 | 96,219
Interest rate risk | Held-to-maturity investments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value | 25,282 | 32,455
Interest rate risk | Available-for-sale investments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Assets Assuming a Hypothetical 10% Increase in Fair Value | 729,758 | 645,639
U.S. dollar | 6% Senior Notes due 2018 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities |  | 10,317,800
Liabilities at fair value |  | 10,858,040
Increase (Decrease) of Fair Value Over Carrying Value of liabilities |  | 540,240
U.S. dollar | 6.625% Senior Notes due 2025 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 11,823,060 | 12,381,360
Liabilities at fair value | 14,065,776 | 14,151,151
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 2,242,716 | 1,769,791
U.S. dollar | 4.625% Senior Notes due 2026 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,911,530 | 6,190,680
Liabilities at fair value | 6,278,104 | 6,229,991
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 366,574 | 39,311
U.S. dollar | 8.50% Senior Notes due 2032 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,911,530 | 6,190,680
Liabilities at fair value | 7,985,945 | 7,566,868
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 2,074,415 | 1,376,188
U.S. dollar | 6.625% Senior Notes due 2040 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 11,823,060 | 12,381,360
Liabilities at fair value | 14,583,508 | 13,039,801
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 2,760,448 | 658,441
U.S. dollar | 5% Senior Notes due 2045 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 19,705,100 | 20,635,600
Liabilities at fair value | 20,068,856 | 17,713,393
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 363,756 | (2,922,207)
U.S. dollar | 6.125% Senior Notes due 2046 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 17,734,590 | 18,572,040
Liabilities at fair value | 21,016,731 | 18,580,026
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 3,282,141 | 7,986
U.S. dollar | Interest rate risk | 6% Senior Notes due 2018 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value |  | 1,626,044
U.S. dollar | Interest rate risk | 6.625% Senior Notes due 2025 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 3,649,294 | 3,184,906
U.S. dollar | Interest rate risk | 4.625% Senior Notes due 2026 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 994,384 | 662,310
U.S. dollar | Interest rate risk | 8.50% Senior Notes due 2032 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 2,873,010 | 2,132,875
U.S. dollar | Interest rate risk | 6.625% Senior Notes due 2040 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 4,218,799 | 1,962,421
U.S. dollar | Interest rate risk | 5% Senior Notes due 2045 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 2,370,642 | (1,150,868)
U.S. dollar | Interest rate risk | 6.125% Senior Notes due 2046 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 5,383,814 | 1,865,989
Mexican peso | 7.38% Notes due 2020 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 10,000,000 | 10,000,000
Liabilities at fair value | 9,702,300 | 9,791,680
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (297,700) | (208,320)
Mexican peso | Notes due 2021 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 6,000,000 | 6,000,000
Liabilities at fair value | 6,090,900 | 5,953,980
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 90,900 | (46,020)
Mexican peso | Notes due 2022 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,000,000 | 5,000,000
Liabilities at fair value | 5,063,300 | 4,942,230
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | 63,300 | (57,770)
Mexican peso | Notes due 2027 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 4,500,000 |
Liabilities at fair value | 4,442,940 |
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (57,060) |
Mexican peso | 8.49% Senior Notes due 2037 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 4,500,000 | 4,500,000
Liabilities at fair value | 4,085,685 | 4,031,550
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (414,315) | (468,450)
Mexican peso | 7.25% Senior Notes due 2043 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 6,500,000 | 6,500,000
Liabilities at fair value | 5,085,925 | 4,712,500
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (1,414,075) | (1,787,500)
Mexican peso | Notes payable to Mexican banks |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 14,142,027 | 9,618,686
Liabilities at fair value | 13,917,175 | 9,331,330
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (224,852) | (287,356)
Mexican peso | Finance lease obligations |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 5,622,774 | 6,391,826
Liabilities at fair value | 5,360,933 | 5,763,903
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (261,841) | (627,923)
Mexican peso | Other notes payable |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities | 3,684,060 | 4,853,025
Liabilities at fair value | 3,319,414 | 4,143,984
Increase (Decrease) of Fair Value Over Carrying Value of liabilities | (364,646) | (709,041)
Mexican peso | Derivative financial instruments |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Carrying value of liabilities |  | 5,508
Liabilities at fair value |  | 5,508
Mexican peso | Interest rate risk | 7.38% Notes due 2020 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 672,530 | 770,848
Mexican peso | Interest rate risk | Notes due 2021 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 699,990 | 549,378
Mexican peso | Interest rate risk | Notes due 2022 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 569,630 | 436,453
Mexican peso | Interest rate risk | Notes due 2027 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 387,234 |
Mexican peso | Interest rate risk | 8.49% Senior Notes due 2037 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | (5,746) | (65,295)
Mexican peso | Interest rate risk | 7.25% Senior Notes due 2043 |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | (905,482) | (1,316,250)
Mexican peso | Interest rate risk | Notes payable to Mexican banks |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 1,166,866 | 645,777
Mexican peso | Interest rate risk | Finance lease obligations |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | 274,252 | (51,533)
Mexican peso | Interest rate risk | Other notes payable |  |
Disclosure of nature and extent of risks arising from financial instruments |  |
Increase (Decrease) of Fair Value Over Carrying Value of Liabilities Assuming a Hypothetical 10% Increase in Fair Value | $ (32,705) | $ (294,643)

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