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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

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