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Deferred Tax Assets and Liabilities - Summary of Recognized Deferred Tax Assets and Liabilities (Detail) - TRY (₺) ₺ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | ₺ 802,550 | ₺ 835,176
Offsetting | (649,818) | (739,116)
Net deferred tax assets/ (liabilities) | 152,732 | 96,060
Deferred tax liabilities | (1,512,178) | (1,390,238)
Offsetting | 649,818 | 739,116
Net deferred tax assets/ (liabilities) | (862,360) | (651,122)
Net deferred tax asset/liabilities | (709,628) | (555,062)
Offsetting | 0 | 0
Net deferred tax assets/(liabilities) | (709,628) | (555,062)
Property, plant & equipment and intangible assets [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 106,128 | 41,903
Deferred tax liabilities | (936,167) | (680,134)
Net deferred tax asset/liabilities | (830,039) | (638,231)
Investment [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 32,926 | 32,926
Net deferred tax asset/liabilities | 32,926 | 32,926
Derivative instruments [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 15,380 | 1,492
Deferred tax liabilities | (429,162) | (182,806)
Net deferred tax asset/liabilities | (413,782) | (181,314)
Reserve for employee termination benefits and provisions [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 155,132 | 202,112
Deferred tax liabilities | (45,581) | (64)
Net deferred tax asset/liabilities | 109,551 | 202,048
Assets classified as held for sale [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax liabilities |  | (92,327)
Net deferred tax asset/liabilities |  | (92,327)
Tax credit carry forwards (investment tax credit) [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 224,179 |
Net deferred tax asset/liabilities | 224,179 |
Tax allowance [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 20,554 | 10,775
Net deferred tax asset/liabilities | 20,554 | 10,775
Other items [member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deferred tax assets | 248,251 | 545,968
Deferred tax liabilities | (101,268) | (434,907)
Net deferred tax asset/liabilities | ₺ 146,983 | ₺ 111,061

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_o&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_56&doctype=Standard -URIDate 2018-03-16 + Details
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