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Impairment of Assets - Belarusian Telecom - Additional Information (Detail) - Belarusian Telecom [member] - TRY (₺) ₺ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items] |  |
Impairment loss recognized | ₺ 228,774 |
Actuarial assumption of weighted average cost of capital [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% | 0.50%
Percentage of reasonably possible decrease in actuarial assumption | (0.50%) | (0.50%)
Individual assets or cash-generating units [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Terminal growth rate | 8.00% | 10.00%
Description on key assumptions | Post-tax WACC rate of 25.4% for the period from 2018 to 2022, a post-tax WACC rate of 24.9% for the period after 2022, and a terminal growth rate of 8.0% were used to extrapolate cash flows beyond the 5-year forecast period based on the business plan. | Post-tax WACC rate of 29.4% for the period from 2017 to 2021, a post-tax WACC rate of 28.7% for the period after 2021 and a terminal growth rate of 10.0% were used to extrapolate cash flows beyond the 5-year forecast period based on the business plan.
Pre-tax rate |  | 30.90%
Individual assets or cash-generating units [member] | 2018 to 2022 [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Post-tax WACC rate | 25.40% | 29.40%
Individual assets or cash-generating units [member] | After 2022 [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Post-tax WACC rate | 24.90% |
Individual assets or cash-generating units [member] | After 2021 [member] |  |
Disclosure of detailed information about intangible assets [line items] |  |
Post-tax WACC rate |  | 28.70%

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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