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Impairment of Assets - Belarusian Telecom - Additional Information (Detail) - Belarusian Telecom [member] - TRY (₺)
₺ in Thousands
 12 Months Ended
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%