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Commitments and Contingencies - Dispute to Treasury Share Amounts - Additional Information (Detail) - TRY (₺)
 12 Months Ended
Apr. 27, 1998
Dec. 31, 2017
Dec. 31, 2016
Disclosure of commitments and contingencies [Line Items]      
Percentage of payment obligation on gross sales per month as treasury share 13.50%    
Percentage of payment obligation on gross sales per month as universal services share 1.50%    
Percentage of payment obligation on annual gross sales as authority contribution share 0.35%    
Provision for litigation settlement amount   ₺ 417,668,000 ₺ 0
Dispute On Treasury Share Amount [member]      
Disclosure of commitments and contingencies [Line Items]      
Litigation principal amount   206,365,000  
Litigation interest amount   209,159,000  
Litigation settlement amount   ₺ 436,300,000