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Financial Instruments - Summary of Movements in Provision for Impairment of Receivables from Financial Services, Trade Receivables and Due from Related Parties (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Trade receivables and due from related parties [member] | Contract assets [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
IFRS 9 effect ₺ 5,128  
Provision for impairment recognized during the year 2,242  
Closing balance 7,370  
Trade receivables and due from related parties [member] | Other assets [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Opening balance 705,440 ₺ 964,311
IFRS 9 effect (43,512)  
Provision for impairment recognized during the year 416,557 180,948
Amounts collected (166,641) (224,460)
Unused amount reversed (73,023) (79,958)
Receivables written off during the year as uncollectible (118,553) (138,529)
Exchange differences 10,540 3,128
Disposal of subsidiaries 3  
Closing balance 730,811 705,440
Receivables from financial services [member]    
Disclosure of financial assets that are either past due or impaired [line items]    
Opening balance 72,992 10,170
IFRS 9 effect 52,951  
Provision for impairment recognized during the year 190,509 117,293
Amounts collected (96,278) (37,503)
Unused amount reversed (19,901) (16,968)
Closing balance ₺ 200,273 ₺ 72,992