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Cash and Cash Equivalents - Additional Information (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents1 [line items]    
Average maturity of time deposits 32 days 49 days
TL [member]    
Cash and cash equivalents1 [line items]    
Effective tax rate 14.30% 11.00%
USD [member]    
Cash and cash equivalents1 [line items]    
Effective tax rate 5.80% 3.60%
EUR [member]    
Cash and cash equivalents1 [line items]    
Effective tax rate 2.20% 2.00%