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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)