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Employee Benefits - Summary of Movement in Reserve for Employee Termination Benefits (Detail) - TRY (₺)
₺ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [abstract]    
Employee termination benefits,beginning balance ₺ 149,449 ₺ 120,755
Service cost 26,971 32,696
Remeasurements (12,699) 3,738
Interest expense 16,957 13,877
Benefit payments (20,065) (21,617)
Employee termination benefits,ending balance ₺ 160,613 ₺ 149,449