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Property and Equipment - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Borrowing cost capitalized ₩ 6,360 ₩ 7,329
Interest rate of capitalized borrowing cost 2.63% 3.22%