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Other Financial Assets and Liabilities - Summary of Financial Assets Held for Trading (Detail) - Financial assets at fair value through profit or loss, classified as held for trading, category [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [Line Items]      
Valuation gains   ₩ 33  
Valuation losses ₩ 3,078   ₩ 2,006