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Property and Equipment - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Borrowing cost capitalized ₩ 8,452 ₩ 6,360
Interest rate of capitalized borrowing cost 2.36% 2.63%