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Financial Risk Management - Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities ₩ 112,513 ₩ 111,110
Gross assets offset (5,446) (4)
Net amounts presented in the statement of financial position 107,067 111,106
Amounts not offset, Financial instruments (81,700) (106,811)
Amounts not offset, Cash collateral 0 0
Net amount 25,367 4,295
Derivatives used for hedging [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 26,135 20,627
Net amounts presented in the statement of financial position 26,135 20,627
Amounts not offset, Financial instruments (3,284) (20,627)
Amounts not offset, Cash collateral 0 0
Net amount 22,851  
Trade payables [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 80,829 90,435
Gross assets offset (5,217)  
Net amounts presented in the statement of financial position 75,612 90,435
Amounts not offset, Financial instruments (73,109) (86,184)
Amounts not offset, Cash collateral 0 0
Net amount 2,503 4,251
Other payables [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities   48
Gross assets offset   (4)
Net amounts presented in the statement of financial position   44
Amounts not offset, Cash collateral   0
Net amount   ₩ 44
Other [Member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 5,549  
Gross assets offset (229)  
Net amounts presented in the statement of financial position 5,320  
Amounts not offset, Financial instruments (5,307)  
Amounts not offset, Cash collateral 0  
Net amount ₩ 13