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Expenses by Nature - Summary of Expenses by Nature Administrative 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 Administrative Expenses [Line Items] |  |  |
Administrative expenses | ₺ (645,196) | ₺ (721,849) | ₺ (625,279)
Employee benefits expenses [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (346,151) | (277,438) | (240,305)
Consultancy expense [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (50,247) | (54,315) | (43,995)
Rent expense [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (36,280) | (30,314) | (23,924)
Impairment expense recognized on receivables [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (36,278) | (211,384) | (196,588)
Travel and entertainment expenses [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (30,957) | (18,913) | (13,484)
Maintenance and repair expenses [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (24,342) | (20,315) | (23,424)
Collection expense [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | (20,415) | (20,827) | (17,533)
Other [member] |  |  |
Summary Of Expenses By Nature Administrative Expenses [Line Items] |  |  |
Administrative expenses | ₺ (100,526) | ₺ (88,343) | ₺ (66,026)

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