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Cash and Cash Equivalents - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents1 [line items]    
Average maturity of time deposits 35 days 32 days
TL [member]    
Cash and cash equivalents1 [line items]    
Effective interest rate 22.50% 14.30%
USD [member]    
Cash and cash equivalents1 [line items]    
Effective interest rate 5.90% 5.80%
EUR [member]    
Cash and cash equivalents1 [line items]    
Effective interest rate 3.30% 2.20%