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Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [Line Items]    
Assets, Total ₩ 7,389 ₩ 227,318
Less: Assets, non-current (4,675) (97,220)
Assets, Current 2,714 130,098
Liabilities, Total 93,770 14,928
Less: Liabilities, non-current (56,547) (14,695)
Liabilities, Current 37,223 233
Interest rate swap [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Liabilities, Total 2,633 3,278
Currency swap [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Assets, Total 7,389 214,648
Liabilities, Total 81,300 11,650
Currency forwards [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Assets, Total   ₩ 12,670
Liabilities, Total ₩ 9,837