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Expenses by Nature - Summary of Expenses by Nature Selling and Marketing Expenses (Detail) - TRY (₺) ₺ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary Of Expenses By Nature Selling And Marketing Expenses [Line Items] |  |  |
Selling and marketing expenses | ₺ (2,005,420) | ₺ (1,910,947) | ₺ (1,901,859)
Selling expenses [member] |  |  |
Summary Of Expenses By Nature Selling And Marketing Expenses [Line Items] |  |  |
Selling and marketing expenses | (898,936) | (757,869) | (783,234)
Marketing expenses [member] |  |  |
Summary Of Expenses By Nature Selling And Marketing Expenses [Line Items] |  |  |
Selling and marketing expenses | (532,989) | (518,382) | (428,596)
Employee benefit expense [member] |  |  |
Summary Of Expenses By Nature Selling And Marketing Expenses [Line Items] |  |  |
Selling and marketing expenses | (394,421) | (354,380) | (381,582)
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) | (191,408)
Other [member] |  |  |
Summary Of Expenses By Nature Selling And Marketing Expenses [Line Items] |  |  |
Selling and marketing expenses | ₺ (96,080) | ₺ (93,786) | ₺ (117,039)

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- Definition The amount of expense relating to the marketing and selling of goods or services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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