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Intangible Assets - Summary of Intangible Assets and Goodwill (Detail) (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year ₺ 8,340,410 ₺ 8,235,989
Impact of IFRS 15 adaption 830,011  
Additions 687,825 79,432
Disposals (38,161) (504)
Transfers 7,811 153
Impairment (3,232) (1,986)
Disposal of subsidiary (5,592)  
Effects of movements in exchange rates 231,100 27,326
Balance at end of year 10,050,172 8,340,410
Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 15,678,873 14,482,018
Impact of IFRS 15 adaption 1,431,901  
Additions 2,264,912 1,172,847
Disposals (225,845) (8,624)
Transfers 7,811 153
Disposal of subsidiary (18,561)  
Effects of movements in exchange rates 483,134 32,479
Balance at end of year 19,622,225 15,678,873
Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 7,338,463 6,246,029
Impact of IFRS 15 adaption 601,890  
Additions 1,577,087 1,093,415
Disposals (187,684) (8,120)
Impairment 3,232 1,986
Disposal of subsidiary (12,969)  
Effects of movements in exchange rates 252,034 5,153
Balance at end of year 9,572,053 7,338,463
Construction in progress [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 127,637 142,875
Additions 485,815 620,463
Transfers (618,032) (638,357)
Effects of movements in exchange rates 22,587 2,656
Balance at end of year 18,007 127,637
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 8,139,628 8,039,431
Additions 6,394 10,154
Disposals (220,986)  
Transfers 466,379 69,945
Effects of movements in exchange rates 331,583 20,098
Balance at end of year 8,722,998 8,139,628
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 2,419,230 1,878,895
Additions 533,311 537,162
Disposals (184,582)  
Effects of movements in exchange rates 180,276 3,173
Balance at end of year 2,948,235 2,419,230
Computer software [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 7,117,116 6,076,405
Additions 1,175,040 470,457
Disposals (4,822) (8,624)
Transfers 159,453 569,153
Disposal of subsidiary (18,370)  
Effects of movements in exchange rates 110,621 9,725
Balance at end of year 8,539,038 7,117,116
Computer software [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 4,770,880 4,237,996
Additions 663,967 537,805
Disposals (3,071) (8,120)
Impairment 3,232 1,219
Disposal of subsidiary (12,793)  
Effects of movements in exchange rates 59,680 1,980
Balance at end of year 5,481,895 4,770,880
Transmission lines [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 71,820 71,602
Additions 1,319 218
Balance at end of year 73,139 71,820
Transmission lines [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 62,468 58,203
Additions 4,549 3,498
Impairment   767
Balance at end of year 67,017 62,468
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
Balance at end of year 11,981 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 11,491 10,588
Additions 583 903
Balance at end of year 12,074 11,491
Indefeasible right of usage [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 112,556 46,017
Additions 5,062 66,539
Balance at end of year 117,618 112,556
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 23,274 18,785
Additions 8,581 4,489
Balance at end of year 31,855 23,274
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
Balance at end of year 7,040 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 6,512 5,808
Additions 528 704
Balance at end of year 7,040 6,512
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 11,774 11,286
Additions 437 488
Balance at end of year 12,211 11,774
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]    
Impact of IFRS 15 adaption 1,431,901  
Additions 583,809  
Effects of movements in exchange rates 18,343  
Balance at end of year 2,034,053  
Subscriber acquisition costs [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Impact of IFRS 15 adaption 601,890  
Additions 360,232  
Effects of movements in exchange rates 12,078  
Balance at end of year 974,200  
Other [member] | Cost [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 42,749 38,321
Additions 7,473 5,016
Disposals (37)  
Transfers 11 (588)
Disposal of subsidiary (191)  
Balance at end of year 50,005 42,749
Other [member] | Accumulated amortization [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 32,834 24,468
Additions 4,899 8,366
Disposals (31)  
Disposal of subsidiary (176)  
Balance at end of year ₺ 37,526 ₺ 32,834