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Expenses by Nature - Summary of Expenses by Nature Selling and Marketing Expenses (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses ₺ (1,626,714) ₺ (2,005,420) ₺ (1,910,947)
Selling expenses [member]      
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses (555,158) (898,936) (757,869)
Marketing expenses [member]      
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses (551,127) (532,989) (518,382)
Employee benefit expense [member]      
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses (440,976) (394,421) (354,380)
Frequency usage fees related to prepaid subscribers [member]      
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses   (82,994) (186,530)
Other [member]      
Summary of expenses by nature selling and marketing expenses [line items]      
Selling and marketing expenses ₺ (79,453) ₺ (96,080) ₺ (93,786)