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Income Tax Expense - Summary of Reconciliation of Effective Income Tax Expense (Detail) - TRY (₺) ₺ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Profit from continuing operations before income tax expense | ₺ 2,609,517 | ₺ 2,009,127 | ₺ 2,203,327
Profit from discontinued operations before income tax expense |  | (42,164) | 367,336
Profit before income tax expense | 2,609,517 | 1,966,963 | 2,570,663
Tax at the Turkey's tax rate | (521,903) | (393,393) | (514,133)
Difference in overseas tax rates | 4,133 | (15,935) | (52,688)
Effect of exemptions | 73,916 | 104,244 | 62,163
Effect of amounts which are not deductible | (102,102) | (78,571) | (16,104)
Utilization of previously unrecognized tax losses |  | 1,253 | 22,863
Change in unrecognized deferred tax assets | (41,340) | (30,616) | (198,364)
Adjustments for current tax of prior years | 11,280 | (8,176) |
Tax effect of investment in associate |  |  | 32,926
Other | 4,258 | (1,966) | (3,775)
Total income tax expense | ₺ (571,758) | ₺ (423,160) | ₺ (667,112)

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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to expenses not deductible in determining taxable profit (tax loss). [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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