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Financial Risk Management - Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of offsetting of financial assets [Line Items]    
Gross assets ₩ 97,719 ₩ 131,199
Gross liabilities offset (5,446)  
Net amounts presented in the statement of financial position 92,273 131,199
Amounts not offset, Financial instruments (81,700) (97,369)
Amounts not offset, Cash collateral 0 0
Net amount 10,573 33,830
Derivative liabilities for hedging purpose [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Gross assets 3,284 35,334
Net amounts presented in the statement of financial position 3,284 35,334
Amounts not offset, Financial instruments (3,284) (5,707)
Amounts not offset, Cash collateral 0 0
Net amount   29,627
Trade receivables [member]    
Disclosure of offsetting of financial assets [Line Items]    
Gross assets 85,755 95,865
Gross liabilities offset (5,010)  
Net amounts presented in the statement of financial position 80,745 95,865
Amounts not offset, Financial instruments (73,109) (91,662)
Amounts not offset, Cash collateral 0 0
Net amount 7,636 ₩ 4,203
Other Financial Assets1 [Member]    
Disclosure of offsetting of financial assets [Line Items]    
Gross assets 8,680  
Gross liabilities offset (436)  
Net amounts presented in the statement of financial position 8,244  
Amounts not offset, Financial instruments (5,307)  
Amounts not offset, Cash collateral 0  
Net amount ₩ 2,937