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Basis of Preparation and Summary of Significant Accounting Policies - Additional Information (Detail) - TRY (₺)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 22, 2017
Apr. 14, 2014
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Impairment of assets       ₺ 19,897,000    
Financial loan sold         ₺ 89,607,000 ₺ 87,589,000
Acquisition of shares     ₺ (267,920,000)      
Depreciation method property plant and equipment Decrease in inflation rate in subsequent years led the three-year cumulative rate as of the end of 2014 to decrease to 65%.          
Three-year cumulative inflation rate       65.00%    
Salary calculation period 30 days          
Employee payments ₺ 1,787,116,000 ₺ 1,490,961,000 1,356,612,000      
Percentage of net earnings to gross earning 1.40%          
Percentage of revenues comprised 7.25%          
Revenue commission percentage 15.00%          
Revenue from operations ₺ 15,115,816,000 ₺ 12,883,974,000 11,972,443,000      
Expected credit loss period 12 months          
Top of range [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Percentage of voting rights in associates 20.00%          
Bottom of range [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Percentage of voting rights in associates 50.00%          
Employee payments ₺ 6,000,000          
Maritime Affairs and Communications [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Revenue from operations ₺ 257,866,000          
Belarusian Telecom [member] | Special GSM and UMTS services licenses [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Service licenses acquired, life 10 years          
Additional contractual life of service license 10 years          
Donetsk and Luhansk [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Impairment Loss ₺ 10,872,000          
Retained earnings [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Acquisition of shares     ₺ (929,013,000)      
Lifecell [member]            
Disclosure of basis of preparation and summary of significant accounting policies [line items]            
Ownership interest percentage     100.00%