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Income Taxes - Rollforward of deferred income tax assets and liabilities (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | $ 12,380,445 | $ 7,665,038
Income statement credit | 1,017,430 | 3,851,836
Credit (Charge) to Other Comprehensive Income and Shares Repurchased | (1,080,344) | 863,571
Deferred income tax account at end of period | 12,317,531 | 12,380,445
Accrued liabilities |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 3,208,863 | 2,656,354
Income statement credit | 179,426 | 552,509
Deferred income tax account at end of period | 3,388,289 | 3,208,863
Allowance for doubtful accounts |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 1,160,708 | 1,187,427
Income statement credit | (44,718) | (26,719)
Deferred income tax account at end of period | 1,115,990 | 1,160,708
Customer advances |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 2,761,196 | 2,598,037
Income statement credit | (530,238) | 163,159
Deferred income tax account at end of period | 2,230,958 | 2,761,196
Property, plant and equipment, net |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (305,654) | (954,678)
Income statement credit | 1,159,085 | 649,024
Deferred income tax account at end of period | 1,159,085 | (305,654)
Tax loss carryforwards |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 13,829,616 | 10,196,480
Income statement credit | (628,278) | 3,633,136
Credit (Charge) to Other Comprehensive Income and Shares Repurchased | (792,348) |
Deferred income tax account at end of period | 12,408,990 | 13,829,616
Deferred income tax assets of foreign subsidiaries |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | 279,683 | 195,348
Income statement credit | (21,914) | 84,335
Deferred income tax account at end of period | 257,769 | 279,683
Asset tax |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period |  | 402,880
Income statement credit |  | (402,880)
Investments |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (4,471,232) | (3,504,137)
Income statement credit | 721,525 | (2,067,429)
Credit (Charge) to Other Comprehensive Income and Shares Repurchased | (218,469) | 1,100,334
Deferred income tax account at end of period | (3,968,176) | (4,471,232)
Property, plant and equipment, net |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (305,654) |
Income statement credit | 305,654 |
Deferred income tax account at end of period |  | (305,654)
Derivative financial instruments |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period |  | (1,801)
Income statement credit | (355,051) | 1,801
Deferred income tax account at end of period | (355,051) |
Intangible assets and transmission rights |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (2,898,572) | (3,922,230)
Income statement credit | 252,305 | 1,023,658
Deferred income tax account at end of period | (2,646,267) | (2,898,572)
Prepaid expenses and other items |  |
Rollforward of deferred income tax assets and liabilities |  |
Deferred income tax account at beginning of period | (1,184,163) | (1,188,642)
Income statement credit | (20,366) | 241,242
Credit (Charge) to Other Comprehensive Income and Shares Repurchased | (69,527) | (236,763)
Deferred income tax account at end of period | $ (1,274,056) | $ (1,184,163)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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