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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year ₺ 8,195,705 ₺ 6,821,494  
Additions 1,469,217 1,432,200  
Disposals (23,675) (21,676)  
Transfers (153) (1,831)  
Impairment expenses/(reversals) (39,721) (43,198) ₺ (18,567)
Effects of movements in exchange rates 21,807 8,716  
Transfer from investment property 42,228    
Balance at end of year 9,665,408 8,195,705 6,821,494
Cost [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 15,947,162 13,623,365  
Additions 2,928,738 2,667,011  
Disposals (1,028,876) (541,924)  
Transfers (153) (1,831)  
Impairment expenses/(reversals) (14,535)    
Effects of movements in exchange rates 121,835 200,541  
Transfer from investment property 64,594    
Balance at end of year 18,018,765 15,947,162 13,623,365
Cost [member] | Network infrastructure [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 13,897,308 11,302,326  
Additions 574,301 615,041  
Disposals (1,009,922) (518,827)  
Transfers 1,907,022 2,312,011  
Effects of movements in exchange rates 111,419 186,757  
Balance at end of year 15,480,128 13,897,308 11,302,326
Cost [member] | Land and Buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 519,702 389,366  
Additions 162,206 26,603  
Disposals (1,340) (32)  
Transfers 39,130 102,311  
Effects of movements in exchange rates 1,766 1,454  
Transfer from investment property 64,594    
Balance at end of year 786,058 519,702 389,366
Cost [member] | Equipment, fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 617,732 586,463  
Additions 117,087 37,545  
Disposals (10,854) (19,291)  
Transfers 2,209 10,079  
Effects of movements in exchange rates 2,028 2,936  
Balance at end of year 728,202 617,732 586,463
Cost [member] | Motor vehicles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 34,136 33,676  
Additions 4,415 2,710  
Disposals (1,719) (2,946)  
Transfers   71  
Effects of movements in exchange rates 384 625  
Balance at end of year 37,216 34,136 33,676
Cost [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 311,761 306,176  
Additions 7,400 5,663  
Disposals (5,041) (374)  
Transfers 486    
Effects of movements in exchange rates 261 296  
Balance at end of year 314,867 311,761 306,176
Cost [member] | Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 566,523 1,005,358  
Additions 2,063,329 1,979,449  
Disposals   (454)  
Transfers (1,949,000) (2,426,303)  
Impairment expenses/(reversals) (14,535)    
Effects of movements in exchange rates 5,977 8,473  
Balance at end of year 672,294 566,523 1,005,358
Accumulated Depreciation [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 7,751,457 6,801,871  
Additions 1,459,521 1,234,811  
Disposals (1,005,201) (520,248)  
Impairment expenses/(reversals) 25,186 43,198  
Effects of movements in exchange rates 100,028 191,825  
Transfer from investment property 22,366    
Balance at end of year 8,353,357 7,751,457 6,801,871
Accumulated Depreciation [member] | Network infrastructure [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 6,843,580 5,976,699  
Additions 1,353,419 1,139,343  
Disposals (990,719) (501,719)  
Impairment expenses/(reversals) 23,589 42,682  
Effects of movements in exchange rates 96,690 186,575  
Balance at end of year 7,326,559 6,843,580 5,976,699
Accumulated Depreciation [member] | Land and Buildings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 159,351 140,627  
Additions 26,295 17,395  
Disposals (221)    
Impairment expenses/(reversals) 1,482 488  
Effects of movements in exchange rates 645 841  
Transfer from investment property 22,366    
Balance at end of year 209,918 159,351 140,627
Accumulated Depreciation [member] | Equipment, fixtures and fittings [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 497,606 462,618  
Additions 48,393 47,001  
Disposals (8,202) (15,229)  
Impairment expenses/(reversals) 115 28  
Effects of movements in exchange rates 1,915 3,188  
Balance at end of year 539,827 497,606 462,618
Accumulated Depreciation [member] | Motor vehicles [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 30,252 29,704  
Additions 2,276 2,723  
Disposals (1,642) (2,926)  
Effects of movements in exchange rates 420 751  
Balance at end of year 31,306 30,252 29,704
Accumulated Depreciation [member] | Leasehold improvements [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Balance at beginning of year 220,668 192,223  
Additions 29,138 28,349  
Disposals (4,417) (374)  
Effects of movements in exchange rates 358 470  
Balance at end of year ₺ 245,747 ₺ 220,668 ₺ 192,223