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Income Taxes - Tax (charge) credit relating to components of other comprehensive income (Details) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other comprehensive loss, Before Tax      
Remeasurement of post-employment benefit obligations $ (283,106) $ (255,713) $ (166,044)
Exchange differences on translating foreign operations 334,097 767,165 498,954
Equity instruments, Before Tax     405,132
Cumulative gain in fair value from equity instruments reclassified to other finance income, Before Tax     (544,402)
Derivative financial instruments cash flow hedges, Before Tax 231,758 789,208 25,838
Convertible Debentures due 2025 issued by UHI, Before Tax     319,307
Cumulative gain in fair value from Convertible Debentures issued by UHI reclassified to other finance income, Before Tax     (4,718,175)
Warrants exercisable for common stock of UHI (280,447) (3,635,399) 3,303,182
Available-for-sale investments, Before Tax 1,008,675 (32,379) (80,371)
Share of loss of associates and joint ventures, Before Tax (60,340) (42,832) 19,705
Other comprehensive income (loss) before income taxes 950,637 (2,409,950) (936,874)
Other comprehensive loss, Tax (Charge) Credit      
Exchange differences on translating foreign operations, Tax (Charge) Credit (78,040) 356,829 206,520
Equity instruments, Tax (Charge) Credit     (121,541)
Cumulative gain in fair value from equity instruments reclassified to other finance income, Tax (Charge) Credit     163,321
Derivative financial instruments cash flow hedges, Tax (Charge) Credit (69,527) (236,763) (7,751)
Convertible Debentures due 2025 issued by UHI, Tax (Charge) Credit     (95,821)
Cumulative gain in fair value from Convertible Debentures issued by UHI reclassified to other finance income, Tax (Charge) Credit     1,415,453
Warrants exercisable for common stock of UHI, Tax (Charge) Credit 84,134 1,090,620 (990,955)
Available-for-sale investments, Tax (Charge) Credit (302,603) 9,714 24,111
Other comprehensive income, Tax (Charge) Credit (366,036) 1,220,400 593,337
Current tax (78,040) 356,829 206,520
Deferred tax (287,996) 863,571 386,817
Other comprehensive loss, After Tax      
Remeasurement of post-employment benefit obligations, After Tax (283,106) (255,713) (166,044)
Exchange differences on translating foreign operations, After Tax 256,057 1,123,994 705,474
Equity instruments, After Tax     283,591
Cumulative gain in fair value from equity instruments reclassified to other finance income, After Tax     (381,081)
Derivative financial instruments cash flow hedges, After Tax 162,231 552,445 18,087
Convertible Debentures due 2025 issued by UHI, After Tax     223,486
Cumulative gain in fair value from Convertible Debentures issued by UHI reclassified to other finance income, After Tax     (3,302,722)
Warrants exercisable for common stock of UHI, After Tax (196,313) (2,544,779) 2,312,227
Available-for-sale investments, After Tax 706,072 (22,665) (56,260)
Share of loss of associates and joint ventures, After Tax (60,340) (42,832) 19,705
Total other comprehensive income 584,601 (1,189,550) $ (343,537)
Deferred income tax liability related to joint ventures $ 1,383,713 $ 1,252,044