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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year ₺ 11,116,316 ₺ 9,665,408  
Additions 1,044,267 1,153,776  
Disposals (30,285) (21,976)  
Transfers (15,896) (7,811)  
Impairment expenses/(reversals) (18,007) (34,382) ₺ (39,721)
Disposal of subsidiary   (10,023)  
Effects of movements in exchange rates 362,096 391,380  
Transfer from (to) investment property   (20,056)  
Balance at end of year 12,458,491 11,116,316 9,665,408
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 21,745,364 18,018,765  
Additions 3,223,162 3,008,228  
Disposals (808,258) (253,242)  
Transfers (12,368) (7,811)  
Impairment expenses/(reversals) (3,125) (10,744)  
Disposal of subsidiary   (22,161)  
Effects of movements in exchange rates 1,002,631 1,058,150  
Transfer from (to) investment property   (45,821)  
Balance at end of year 25,147,406 21,745,364 18,018,765
Cost [member] | Network infrastructure [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 19,132,278 15,480,128  
Additions 708,891 650,610  
Disposals (756,889) (232,888)  
Transfers 1,982,073 2,270,262  
Disposal of subsidiary   (15,081)  
Effects of movements in exchange rates 956,638 979,247  
Balance at end of year 22,022,991 19,132,278 15,480,128
Cost [member] | Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 929,901 786,058  
Additions 52,877 28,828  
Disposals   (2,535)  
Transfers 220,637 156,540  
Effects of movements in exchange rates 7,908 6,831  
Transfer from (to) investment property   (45,821)  
Balance at end of year 1,211,323 929,901 786,058
Cost [member] | Equipment, fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 803,500 728,202  
Additions 97,225 59,311  
Disposals (48,813) (15,827)  
Transfers 1,446 10,712  
Disposal of subsidiary   (4,041)  
Effects of movements in exchange rates 13,051 25,143  
Balance at end of year 866,409 803,500 728,202
Cost [member] | Motor vehicles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 40,106 37,216  
Additions 3,833 3,121  
Disposals (491) (775)  
Transfers 0    
Disposal of subsidiary   (1,400)  
Effects of movements in exchange rates 1,070 1,944  
Balance at end of year 44,518 40,106 37,216
Cost [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 327,492 314,867  
Additions 5,418 5,998  
Disposals (7) (547)  
Transfers 317 3,123  
Disposal of subsidiary   (1,639)  
Effects of movements in exchange rates 2,617 5,690  
Balance at end of year 335,837 327,492 314,867
Cost [member] | Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 512,087 672,294  
Additions 2,354,918 2,260,360  
Disposals (2,058) (670)  
Transfers (2,216,841) (2,448,448)  
Impairment expenses/(reversals) (3,125) (10,744)  
Effects of movements in exchange rates 21,347 39,295  
Balance at end of year 666,328 512,087 672,294
Accumulated depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 10,629,048 8,353,357  
Additions 2,178,895 1,854,452  
Disposals (777,973) (231,266)  
Transfers 3,528    
Impairment expenses/(reversals) 14,882 23,638  
Disposal of subsidiary   (12,138)  
Effects of movements in exchange rates 640,535 666,770  
Transfer from (to) investment property   (25,765)  
Balance at end of year 12,688,915 10,629,048 8,353,357
Accumulated depreciation [member] | Network infrastructure [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 9,446,217 7,326,559  
Additions 2,006,650 1,693,374  
Disposals (738,527) (218,894)  
Transfers 31,327    
Impairment expenses/(reversals) 14,543 23,568  
Disposal of subsidiary   (6,887)  
Effects of movements in exchange rates 622,603 628,497  
Balance at end of year 11,382,813 9,446,217 7,326,559
Accumulated depreciation [member] | Land and buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 239,088 209,918  
Additions 58,292 50,514  
Disposals   (274)  
Transfers (16,359)    
Impairment expenses/(reversals)   9  
Effects of movements in exchange rates 4,605 4,686  
Transfer from (to) investment property   (25,765)  
Balance at end of year 285,626 239,088 209,918
Accumulated depreciation [member] | Equipment, fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 633,507 539,827  
Additions 80,254 77,694  
Disposals (39,143) (10,839)  
Transfers (11,440)    
Impairment expenses/(reversals)   49  
Disposal of subsidiary   (2,694)  
Effects of movements in exchange rates 10,749 29,470  
Balance at end of year 673,927 633,507 539,827
Accumulated depreciation [member] | Motor vehicles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 34,230 31,306  
Additions 2,923 2,637  
Disposals (296) (712)  
Disposal of subsidiary   (918)  
Effects of movements in exchange rates 983 1,917  
Balance at end of year 37,840 34,230 31,306
Accumulated depreciation [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 276,006 245,747  
Additions 30,776 30,233  
Disposals (7) (547)  
Impairment expenses/(reversals) 339 12  
Disposal of subsidiary   (1,639)  
Effects of movements in exchange rates 1,595 2,200  
Balance at end of year ₺ 308,709 ₺ 276,006 ₺ 245,747