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Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Assets, Total ₩ 29,843 ₩ 7,389
Less: Assets, non-current (4,732) (4,675)
Assets, Current 25,111 2,714
Liabilities, Total 57,308 93,771
Less: Liabilities, non-current (56,366) (56,547)
Liabilities, Current 942 37,224
Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, Total 599 2,633
Currency swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, Total 29,843 7,389
Liabilities, Total 54,074 81,300
Currency forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, Total ₩ 2,635 ₩ 9,838