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Expenses by Nature - Summary of Expenses by Nature Administrative Expenses (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses ₺ (673,370) ₺ (645,196) ₺ (721,849)
Employee benefit expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses (425,681) (346,151) (277,438)
Travel and entertainment expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses (38,406) (30,957) (18,913)
Consultancy expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses (38,252) (50,247) (54,315)
Collection expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses (37,525) (20,415) (20,827)
Maintenance and repair expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses (26,867) (24,342) (20,315)
Rent expenses [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses   (36,280) (30,314)
Impairment expense recognized on receivables [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses   (36,278) (211,384)
Other [member]      
Summary of expenses by nature administrative expenses [line items]      
Administrative expenses ₺ (106,639) ₺ (100,526) ₺ (88,343)