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Borrowings - Summary of Short-term Borrowing (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 0.00%  
Short-term borrowings ₩ 95,789 ₩ 83,500
NongHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 40,189 15,000
Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 22,500 57,500
Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 10,000 10,000
SooHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings   ₩ 1,000
Woori Bank [Member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 1,900  
Industrial Bank Of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 200  
Hana Bank [Member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings ₩ 11,000  
Short-term borrowings [member] | NongHyup Bank [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.74%  
Short-term borrowings [member] | NongHyup Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 2.36%  
Short-term borrowings [member] | Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.431%  
Annual interest rates description CD91+1.431%  
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 2.46%  
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 2.96%  
Short-term borrowings [member] | Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.34%  
Short-term borrowings [member] | Woori Bank [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.57%  
Short-term borrowings [member] | Industrial Bank Of Korea [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 1.74%  
Short-term borrowings [member] | Hana Bank [Member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.20%