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Expenses by Nature - Summary of Expenses by Nature Administrative Expenses (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
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)