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Borrowings - Summary of Long-term Borrowings (Detail)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2018
KRW (₩)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
KRW (₩)
Dec. 31, 2017
USD ($)
Jan. 01, 2017
KRW (₩)
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 6,648,293   ₩ 6,683,662    
Total ₩ 5,279,812   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 2.808% 2.808%      
Kookmin Bank [member] | Vessel facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates adjustment rate 2.808% 2.808%      
Long-term borrowings [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 546,090   587,133    
Less: Current portion (394,927)   (87,398)    
Total 151,163   499,735    
Long-term borrowings [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Borrowings ₩ 30,000   30,000    
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 ₩ 3,948   4,688    
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 2.93% 2.93%      
Borrowings ₩ 5,000   30,000    
Long-term borrowings [member] | Shinhan Bank [member] | Facility loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 3.01% 3.01%      
Borrowings ₩ 30,000   6,000    
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 ₩ 10,063 $ 9,000 16,071 $ 15,000  
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    
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 ₩ 6,000   8,000    
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   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 ₩ 104   123    
Long-term borrowings [member] | Korea Development Bank [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 3.30% 3.30%      
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]          
Disclosure of detailed information about borrowings [line items]          
Annual interest rates 3.02% 3.02%      
Borrowings ₩ 10,000        
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    
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]          
Annual interest rates 1.00% 1.00%      
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 4.59% 4.59%      
Borrowings ₩ 142,025 $ 127,023 ₩ 177,968 $ 166,108