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Investments in Associates and Joint Ventures - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of associates [abstract]    
Loss from associates and joint ventures not recognized ₩ 6,124 ₩ 1,908
Accumulated comprehensive loss of associates and joint ventures not recognized ₩ 12,599 ₩ 6,475