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Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2017
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of detailed information about borrowings [Line Items]    
Limit ₩ 2,881,232 $ 253,500
Used amount 563,022 181,108
Bank overdraft [Member] | Kookmin Bank and others [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 1,730,000  
Used amount 72  
Commercial papers [member] | NH Investment & Security Co., Ltd. [member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 370,000  
Used amount 300,000  
Collateralized loan on accounts receivable-trade [Member] | NongHyup Bank [member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 35,560  
Collateralised loans on electronic receivable-trade [Member] | Shinhan Bank and others [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 343,000  
Used amount 42,350  
Plus electronic notes payable [Member] | Industrial Bank of Korea [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 50,000  
Used amount 140  
Loans for working capital [Member] | Korea Development Bank and others [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 306,500  
Used amount 207,300  
Green energy factoring [Member] | Shinhan Bank [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 16  
Used amount 16  
FX forward trading commitment [Member] | Shinhan Bank [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit | $   11,500
Used amount | $   0
Facility loans [Member] | Kookmin Bank and others [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 8,456 212,000
Used amount 8,456 166,108
Facility loans on ships [Member] | Shinhan Bank [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit | $   30,000
Used amount | $   $ 15,000
Inter-Korean Cooperation Fund [Member] | Export-Import Bank of Korea [Member]    
Disclosure of detailed information about borrowings [Line Items]    
Limit 37,700  
Used amount ₩ 4,688