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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, 2018
Dec. 31, 2017
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities ₩ 98,144 ₩ 112,513
Gross assets offset (1) (5,446)
Net amounts presented in the statement of financial position 98,143 107,067
Amounts not offset, Financial instruments (96,238) (81,700)
Amounts not offset, Cash collateral 0 0
Net amount 1,905 25,367
Derivative used for hedge [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities   26,135
Net amounts presented in the statement of financial position   26,135
Amounts not offset, Financial instruments   (3,284)
Amounts not offset, Cash collateral   0
Net amount   22,851
Trade payables [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 78,317 80,829
Gross assets offset   (5,217)
Net amounts presented in the statement of financial position 78,317 75,612
Amounts not offset, Financial instruments (76,413) (73,109)
Amounts not offset, Cash collateral 0 0
Net amount 1,904 2,503
Other [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 19,827 5,549
Gross assets offset (1) (229)
Net amounts presented in the statement of financial position 19,826 5,320
Amounts not offset, Financial instruments (19,825) (5,307)
Amounts not offset, Cash collateral 0 0
Net amount ₩ 1 ₩ 13