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Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2018
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Limit ₩ 2,944,683 $ 232,500
Used amount 606,695 137,180
Bank overdraft [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 1,697,000  
Commercial papers [member] | NH Investment & Security Co., Ltd. [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 300,000  
Used amount 300,000  
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 37,700  
Used amount 3,948  
Collateralised loans on electronic receivable-trade [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 495,560  
Used amount 70,759  
Plus electronic notes payable [member] | Industrial Bank of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 50,000  
Used amount 960  
Loans for working capital [member] | Korea Development Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 254,300  
Used amount 158,000  
Facility loans [member] | Kookmin Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   212,000
Used amount | $   127,024
Facility loans [member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 10,123  
Used amount 8,406  
Facility loans on ships [member] | Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   9,000
Used amount | $   9,000
Export L C [member] | Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Used amount | $   1,156
Derivatives transaction limit [member] | Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit 100,000  
Used amount ₩ 64,622  
FX forward trading commitment [member] | Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Limit | $   $ 11,500