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Subsidiaries - Schedule of Non-Wholly Owned Subsidiaries That Have Material Non-Controlling Interests (Detail) - TRY (₺)
₺ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]      
Profit / (loss) allocated to non-controlling interests ₺ 58,630 ₺ 51,715 ₺ (164,103)
Accumulated non controlling interests ₺ 55,927 ₺ 56,632  
Inteltek [member]      
Disclosure of subsidiaries [line items]      
Place of incorporation and principal place of business Turkey    
Proportion of own interests and voting held by non-controlling interest 45.00% 45.00%  
Profit / (loss) allocated to non-controlling interests ₺ 35,924 ₺ 39,346  
Accumulated non controlling interests 46,072 50,863  
Subsidiaries with immaterial non-controlling interests [member]      
Disclosure of subsidiaries [line items]      
Profit / (loss) allocated to non-controlling interests 22,706 12,369  
Accumulated non controlling interests ₺ 9,855 ₺ 5,769