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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, 2018
Dec. 31, 2017
Discount rate [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% increase (13.00%) (14.60%)
1% decrease 15.70% 18.10%
1% increase ₺ (20,880) ₺ (21,820)
1% decrease ₺ 25,216 ₺ 27,050
Inflation rate [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% increase 16.50% 18.30%
1% decrease (13.70%) (14.30%)
1% increase ₺ 26,501 ₺ 27,349
1% decrease ₺ (22,004) ₺ (21,371)