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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Accumulated Other Comprehensive Income (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Total accumulated other comprehensive income ₩ 50,158 ₩ 30,985 ₩ (1,432) ₩ (1,432)
Changes in investments in associates and joint ventures [member]        
Total accumulated other comprehensive income (871) (735)   (10,883)
Loss on derivatives valuation [member]        
Total accumulated other comprehensive income (30,474) (3,463)   (34,309)
Gain on valuation of financial assets at fair value through other comprehensive income [member]        
Total accumulated other comprehensive income 96,704 52,673    
Gain of valuation on available for sale [member]        
Total accumulated other comprehensive income   52,673   54,106
Exchange differences on translation for foreign operations [member]        
Total accumulated other comprehensive income ₩ (15,201) ₩ (17,490)   ₩ (10,346)