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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Total accumulated other comprehensive income ₩ 30,985 ₩ (1,432) ₩ 13,870
Changes in investments in associates and joint ventures [member]      
Total accumulated other comprehensive income (735) (10,883) (10,312)
Loss on derivatives valuation [member]      
Total accumulated other comprehensive income (3,463) (34,309) (23,234)
Gain of valuation on available for sale [member]      
Total accumulated other comprehensive income 52,673 54,106 52,415
Foreign currency translation adjustment [Member]      
Total accumulated other comprehensive income ₩ (17,490) ₩ (10,346) ₩ (4,999)