Income Tax Expense - Summary of Reconciliation of Effective Income Tax Expense (Detail) - TRY (₺) ₺ in Thousands	12 Months Ended
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)

Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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The profit (loss) from continuing operations before tax expense or income. [Refer: Profit (loss)]

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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]

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