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Trade Receivables and Accrued Income - Additional Information (Detail) - TRY (₺)
₺ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Trade Receivables And Accrued Income [line items]    
Letters of guarantee received ₺ 174,975 ₺ 339,543
Trade receivables [member]    
Trade Receivables And Accrued Income [line items]    
Allowance for doubtful debts related to outstanding balances 738,181 ₺ 705,213
Contracted receivables [member]    
Trade Receivables And Accrued Income [line items]    
Non-current undue assigned contracted receivables ₺ 115,001