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Investment properties - Summary of increase (decrease) in fair value (Detail) - TRY (₺)
₺ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about investment property    
Opening balance ₺ 245,206  
Closing balance 222,623 ₺ 245,206
Cost    
Disclosure of detailed information about investment property    
Opening balance 2,246,125 2,246,125
Closing balance 2,246,125 2,246,125
Accumulated depreciation, amortization and impairment    
Disclosure of detailed information about investment property    
Opening balance (2,000,919) (1,977,083)
Depreciation and impairment charges during the year (22,583) (23,836)
Closing balance ₺ (2,023,502) ₺ (2,000,919)