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Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - 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 gain ₩ 57 ₩ 109,436 ₩ 141,512
Valuation loss 209,582 138 1,733
Other comprehensive income (146,508) 85,483 147,644
Interest rate swap [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Valuation gain 38    
Valuation loss   148  
Other comprehensive income 637 (142) (2,858)
Currency swap [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Valuation gain 19 97,158 141,512
Valuation loss 187,468 (10) 1,733
Other comprehensive income (146,752) 85,479 150,255
Currency forwards [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Valuation gain   12,278  
Valuation loss 22,114    
Other comprehensive income ₩ (393) ₩ 146 ₩ 247