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Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2020
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Limit ₩ 2,559,505 $ 281,054
Used amount 202,577 93,471
Bank overdraft [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 1,502,000  
Used amount 0  
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 37,700  
Used amount 2,714  
Insurance for Economic Cooperation project [Member] | Export-Import Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 3,240  
Used amount 1,732  
Collateralised loans on electronic receivable-trade [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 522,849  
Used amount 23,475  
Plus electronic notes payable [member] | Industrial Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 50,000  
Used amount 331  
Loans for working capital [member] | Korea Development Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 243,593  
Used amount 152,243  
Facility loans [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   212,000
Used amount | $   48,855
Facility loans [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 100,123  
Used amount 55  
Derivatives transaction limit [member] | Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 100,000  
Used amount ₩ 22,027  
Derivatives transaction limit [member] | Woori Bank and others [Member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   69,054
Used amount | $   $ 44,616