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Intangible Assets - Summary of Intangible Assets and Goodwill (Detail) (Detail) - TRY (₺) ₺ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | ₺ 8,235,989 | ₺ 8,232,637
Additions | 79,432 | (30,218)
Disposals | (504) | (3,473)
Transfers | 153 | 1,831
Impairment | (1,986) | (3,181)
Effects of movements in exchange rates | 27,326 | 38,393
Balance at end of year | 8,340,410 | 8,235,989
Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 14,482,018 | 13,540,980
Additions | 1,172,847 | 888,413
Disposals | (8,624) | (6,632)
Transfers | 153 | 1,831
Effects of movements in exchange rates | 32,479 | 57,426
Balance at end of year | 15,678,873 | 14,482,018
Accumulated amortization [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 6,246,029 | 5,308,343
Additions | 1,093,415 | 918,631
Disposals | (8,120) | (3,159)
Impairment | 1,986 | 3,181
Effects of movements in exchange rates | 5,153 | 19,033
Balance at end of year | 7,338,463 | 6,246,029
Construction in progress [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 142,875 | 52,597
Additions | 620,463 | 478,179
Transfers | (638,357) | (391,496)
Effects of movements in exchange rates | 2,656 | 3,595
Balance at end of year | 127,637 | 142,875
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 | 8,039,431 | 3,950,729
Additions | 10,154 | 34,494
Disposals |  | (4)
Transfers | 69,945 | 4,021,090
Effects of movements in exchange rates | 20,098 | 33,122
Balance at end of year | 8,139,628 | 8,039,431
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 | 1,878,895 | 1,429,944
Additions | 537,162 | 445,069
Disposals |  | (4)
Effects of movements in exchange rates | 3,173 | 3,886
Balance at end of year | 2,419,230 | 1,878,895
Computer software [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 6,076,405 | 5,342,056
Additions | 470,457 | 329,836
Disposals | (8,624) | (6,444)
Transfers | 569,153 | 390,248
Effects of movements in exchange rates | 9,725 | 20,709
Balance at end of year | 7,117,116 | 6,076,405
Computer software [member] | Accumulated amortization [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 4,237,996 | 3,771,710
Additions | 537,805 | 454,111
Disposals | (8,120) | (2,972)
Impairment | 1,219 |
Effects of movements in exchange rates | 1,980 | 15,147
Balance at end of year | 4,770,880 | 4,237,996
Transmission lines [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 71,602 | 71,506
Additions | 218 | 96
Balance at end of year | 71,820 | 71,602
Transmission lines [member] | Accumulated amortization [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 58,203 | 52,058
Additions | 3,498 | 3,615
Impairment | 767 | 2,530
Balance at end of year | 62,468 | 58,203
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 | 11,907
Transfers |  | 74
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 | 10,588 | 9,663
Additions | 903 | 925
Balance at end of year | 11,491 | 10,588
Indefeasible right of usage [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 46,017 | 42,132
Additions | 66,539 | 3,885
Balance at end of year | 112,556 | 46,017
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 | 18,785 | 15,446
Additions | 4,489 | 3,339
Balance at end of year | 23,274 | 18,785
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 | 5,808 | 5,104
Additions | 704 | 704
Balance at end of year | 6,512 | 5,808
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 | 11,286 | 10,111
Additions | 488 | 1,175
Balance at end of year | 11,774 | 11,286
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
Other [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 38,321 | 29,713
Additions | 5,016 | 8,607
Disposals |  | (184)
Transfers | (588) | 185
Balance at end of year | 42,749 | 38,321
Other [member] | Accumulated amortization [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year | 24,468 | 14,307
Additions | 8,366 | 9,693
Disposals |  | (183)
Impairment |  | 651
Balance at end of year | ₺ 32,834 | 24,468
4.5g license not yet available for use [member] | Cost [member] |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |
Balance at beginning of year |  | 3,984,954
Additions |  | 33,316
Transfers |  | ₺ (4,018,270)

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