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Borrowings - Summary of Long-term Borrowings (Detail)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings ₩ 7,298,867   ₩ 6,648,293  
Total ₩ 6,113,142   5,279,812  
Shinhan Bank [member] | Vessel facility loans [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates adjustment rate 1.908% 1.908%    
Long-term borrowings [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings ₩ 190,780   546,090  
Less: Current portion (50,192)   (394,927)  
Total 140,588   151,163  
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 ₩ 3,454   3,948  
Long-term borrowings [member] | Industrial Bank of Korea [member] | General loans [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 2.98% 2.98%    
Borrowings ₩ 6,000      
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 2.81% 2.81%    
Borrowings ₩ 5,000   5,000  
Long-term borrowings [member] | Shinhan Bank [member] | Facility loans [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 3.06% 3.06%    
Borrowings ₩ 30,008 $ 25,918 30,000  
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 ₩ 3,473 $ 3,000 10,063 $ 9,000
Long-term borrowings [member] | Standard Charted Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings     6,000  
Long-term borrowings [member] | NongHyup Bank [member] | General loans [member]        
Disclosure of detailed information about borrowings [line items]        
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 ₩ 79   104  
Long-term borrowings [member] | Korea Development Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 3.31% 3.31%    
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   10,000  
Long-term borrowings [member] | NH Investment & Security Co., Ltd. [member] | Commercial papers [member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings     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]        
Borrowings ₩ 101,816 $ 87,940 ₩ 142,025 $ 127,023