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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, 2020
Dec. 31, 2019
Interest rate [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 1.00% 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00% 1.00%
Impact on provision for increase in assumption, percentage (14.10%) (14.20%)
Impact on provision for decrease in assumption, percentage 17.30% 17.40%
Impact on provision for increase in assumption ₺ (42,566) ₺ (31,547)
Impact on provision for decrease in assumption ₺ 52,122 ₺ 38,657
Inflation rate [member]    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage of reasonably possible increase in actuarial assumption 1.00% 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00% 1.00%
Impact on provision for increase in assumption, percentage 17.60% 17.90%
Impact on provision for decrease in assumption, percentage (14.60%) (14.70%)
Impact on provision for increase in assumption ₺ 53,117 ₺ 39,767
Impact on provision for decrease in assumption ₺ (43,953) ₺ (32,658)