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Intangible Assets - Summary of Intangible Assets and Goodwill (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year ₺ 10,050,172 ₺ 8,340,410
Impact of IFRS 15 adaption   830,011
Additions 902,895 687,825
Disposals (3,738) (38,161)
Transfers 13,097 7,811
Impairment (2,540) (3,232)
Disposal of subsidiary   (5,592)
Effects of movements in exchange rates 348,176 231,100
Balance at end of year 11,308,062 10,050,172
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 19,622,225 15,678,873
Impact of IFRS 15 adaption   1,431,901
Additions 2,821,111 2,264,912
Disposals (101,544) (225,845)
Transfers 12,927 7,811
Impairment (585)  
Disposal of subsidiary   (18,561)
Effects of movements in exchange rates 529,169 483,134
Balance at end of year 22,883,303 19,622,225
Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 9,572,053 7,338,463
Impact of IFRS 15 adaption   601,890
Additions 1,918,216 1,577,087
Disposals (97,806) (187,684)
Transfers (170)  
Impairment 1,955 3,232
Disposal of subsidiary   (12,969)
Effects of movements in exchange rates 180,993 252,034
Balance at end of year 11,575,241 9,572,053
Construction in progress [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 18,007 127,637
Additions 85,202 485,815
Transfers (96,991) (618,032)
Impairment (585)  
Effects of movements in exchange rates 7,819 22,587
Balance at end of year 13,452 18,007
GSM and other telecommunication operating licenses [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 8,722,998 8,139,628
Additions 8,871 6,394
Disposals (17,035) (220,986)
Transfers 29,161 466,379
Effects of movements in exchange rates 388,622 331,583
Balance at end of year 9,132,617 8,722,998
GSM and other telecommunication operating licenses [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 2,948,235 2,419,230
Additions 611,197 533,311
Disposals (17,035) (184,582)
Impairment 17  
Effects of movements in exchange rates 90,554 180,276
Balance at end of year 3,632,968 2,948,235
Computer software [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 8,539,038 7,117,116
Additions 1,441,780 1,175,040
Disposals (44,952) (4,822)
Transfers 89,729 159,453
Disposal of subsidiary   (18,370)
Effects of movements in exchange rates 108,329 110,621
Balance at end of year 10,133,924 8,539,038
Computer software [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 5,481,895 4,770,880
Additions 768,238 663,967
Disposals (41,214) (3,071)
Transfers 7,770  
Impairment 1,902 3,232
Disposal of subsidiary   (12,793)
Effects of movements in exchange rates 71,542 59,680
Balance at end of year 6,290,133 5,481,895
Transmission lines [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 73,139 71,820
Additions 1,240 1,319
Balance at end of year 74,379 73,139
Transmission lines [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 67,017 62,468
Additions 4,585 4,549
Balance at end of year 71,602 67,017
Central betting system operating right [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 11,981 11,981
Additions 445  
Balance at end of year 12,426 11,981
Central betting system operating right [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 12,074 11,491
Additions 301 583
Balance at end of year 12,375 12,074
Indefeasible right of usage [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 117,618 112,556
Additions   5,062
Balance at end of year 117,618 117,618
Indefeasible right of usage [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 31,855 23,274
Additions 8,565 8,581
Balance at end of year 40,420 31,855
Brand name [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 7,040 7,040
Additions 700  
Balance at end of year 7,740 7,040
Brand name [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 7,040 6,512
Additions   528
Balance at end of year 7,040 7,040
Customer base [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 15,512 15,512
Balance at end of year 15,512 15,512
Customer base [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 12,211 11,774
Additions 437 437
Balance at end of year 12,648 12,211
Goodwill [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 32,834 32,834
Balance at end of year 32,834 32,834
Subscriber acquisition costs [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 2,034,053  
Impact of IFRS 15 adaption   1,431,901
Additions 1,232,539 583,809
Disposals (39,496)  
Effects of movements in exchange rates 21,763 18,343
Balance at end of year 3,248,859 2,034,053
Subscriber acquisition costs [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 974,200  
Impact of IFRS 15 adaption   601,890
Additions 495,861 360,232
Disposals (39,496)  
Effects of movements in exchange rates 17,041 12,078
Balance at end of year 1,447,606 974,200
Other [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 50,005 42,749
Additions 50,334 7,473
Disposals (61) (37)
Transfers (8,972) 11
Disposal of subsidiary   (191)
Effects of movements in exchange rates 2,636  
Balance at end of year 93,942 50,005
Other [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 37,526 32,834
Additions 29,032 4,899
Disposals (61) (31)
Transfers (7,940)  
Impairment 36  
Disposal of subsidiary   (176)
Effects of movements in exchange rates 1,856  
Balance at end of year ₺ 60,449 ₺ 37,526