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Employee Benefits - Summary of Sensitivity of Provision for Employee Termination Benefits to Changes in the Significant Actuarial Assumptions (Detail) - TRY (₺)
₺ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Discount Rate [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% increase (14.60%) (14.70%)
1% decrease 18.10% 18.10%
1% increase ₺ (21,820) ₺ (17,751)
1% decrease ₺ 27,050 ₺ 21,857
Inflation Rate [Member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% increase 18.30% 18.60%
1% decrease (14.30%) (15.10%)
1% increase ₺ 27,349 ₺ 22,460
1% decrease ₺ (21,371) ₺ (18,234)