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Trade Receivables and Accrued Income - Additional Information (Detail) - TRY (₺)
₺ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Trade Receivables And Accrued Income [Line Items]    
Letters of guarantee received ₺ 339,543 ₺ 156,647
Trade receivables [member]    
Trade Receivables And Accrued Income [Line Items]    
Allowance for doubtful debts related to outstanding balances 705,213 964,080
Contracted receivables [member]    
Trade Receivables And Accrued Income [Line Items]    
Non-current Undue assigned contracted receivables ₺ 131,392 ₺ 217,492