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Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Assets, Total ₩ 7,684 ₩ 58,576
Less: Assets, non-current (2,111) (28,304)
Assets, Current 5,573 30,272
Liabilities, Total 127,929 20,096
Less: Liabilities, non-current (126,408) (19,177)
Liabilities, Current 1,521 919
Interest rate swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Liabilities, Total 1,078 1,464
Currency swap [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, Total 7,684 55,569
Liabilities, Total 126,189 18,632
Currency forwards [member]    
Disclosure of detailed information about financial instruments [line items]    
Assets, Total   ₩ 3,007
Liabilities, Total ₩ 662