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Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2019
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Limit ₩ 2,648,575 $ 215,000
Used amount 208,924 90,940
Bank overdraft [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 1,637,000  
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 3,454  
Collateralised loans on electronic receivable-trade [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 467,560  
Used amount 29,102  
Plus electronic notes payable [member] | Industrial Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 50,000  
Used amount 3,138  
Loans for working capital [member] | Korea Development Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 254,193  
Used amount 154,693  
Facility loans [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   212,000
Used amount | $   87,940
Facility loans [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 102,122  
Used amount 79  
Facility loans on ships [member] | Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   3,000
Used amount | $   $ 3,000
Derivatives transaction limit [member] | Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 100,000  
Used amount ₩ 18,458