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Borrowings - Summary of Long-term Borrowings (Detail)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2017
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
KRW (₩)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about borrowings [Line Items]        
Borrowings ₩ 6,683,662   ₩ 8,120,791  
Total ₩ 5,110,188   6,300,790  
Shinhan Bank [Member] | Vessel facility loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates adjustment rate 1.695% 1.695%    
Kookmin Bank [member] | Vessel facility loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates adjustment rate 1.695% 1.695%    
Long-term borrowings [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings ₩ 587,133   644,243  
Less: Current portion (87,398)   (59,331)  
Total ₩ 499,735   584,912  
Long-term borrowings [member] | Export-Import Bank of Korea [Member] | Inter-Korean Cooperation Fund [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 1.50% 1.50%    
Borrowings ₩ 4,688   5,181  
Long-term borrowings [member] | Shinhan Bank [Member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 2.50% 2.50%    
Borrowings ₩ 30,000   31,000  
Long-term borrowings [member] | Shinhan Bank [Member] | Facility loans [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 2.56% 2.56%    
Borrowings ₩ 6,000   6,493  
Long-term borrowings [member] | Shinhan Bank [Member] | Vessel facility loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates description LIBOR(3M)+0.706%      
Annual interest rates adjustment rate 0.706% 0.706%    
Borrowings ₩ 16,071 $ 15,000 25,379 $ 21,000
Long-term borrowings [member] | KEB Hana Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 3.95% 3.95%    
Borrowings ₩ 3,000   3,000  
Long-term borrowings [member] | Woori Bank [Member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings     13,000  
Long-term borrowings [member] | NongHyup Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 2.86% 2.86%    
Borrowings ₩ 8,000      
Long-term borrowings [member] | NongHyup Bank [member] | Facility loans [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 2.00% 2.00%    
Borrowings ₩ 123   123  
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 3.27% 3.27%    
Borrowings ₩ 30,000   30,000  
Long-term borrowings [member] | Kookmin Bank [member] | Facility loans [Member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 2.59% 2.59%    
Borrowings ₩ 2,333   7,000  
Long-term borrowings [member] | NH Investment & Security Co., Ltd. [member] | Commercial papers [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 3.17% 3.17%    
Borrowings ₩ 300,000   300,000  
Long-term borrowings [member] | Other Financial Instruments [member] | Redeemable convertible preferred stock [member]        
Disclosure of detailed information about borrowings [Line Items]        
Borrowings ₩ 950   950  
Long-term borrowings [member] | Other Financial Instruments [member] | Kookmin Bank and other [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 3.15% 3.15%    
Borrowings ₩ 177,968 $ 166,108 ₩ 222,117 $ 183,796
Long-term borrowings [member] | Standard Charted Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [Line Items]        
Annual interest rates 3.16% 3.16%    
Borrowings ₩ 8,000