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Financial Risk Management - Monetary Assets and Liabilities Denominated in Foreign Currencies (Detail)
€ in Thousands, ¥ in Thousands, $ in Thousands, ₩ in Millions
Dec. 31, 2018
KRW (₩)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
JPY (¥)
Jan. 01, 2018
KRW (₩)
Dec. 31, 2017
KRW (₩)
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies ₩ 7,110,730       ₩ (11,997) ₩ 7,461,181
Monetary liabilities denominated in foreign currencies 16,800,116         ₩ 12,725,704
Currency risk [member]            
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies 224,431 $ 173,560 € 14,575 ¥ 813,676    
Monetary liabilities denominated in foreign currencies 1,779,433 $ 1,588,522 € 69 ¥ 315,756    
Currency risk [member] | US Dollar [member]            
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies 194,058          
Monetary liabilities denominated in foreign currencies 1,776,126          
Currency risk [member] | Euro [member]            
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies 18,645          
Monetary liabilities denominated in foreign currencies 89          
Currency risk [member] | Yen [member]            
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies 8,244          
Monetary liabilities denominated in foreign currencies 3,200          
Currency risk [member] | Other currencies [member]            
Disclosure of detailed information about financial instruments [Line items]            
Monetary assets denominated in foreign currencies 3,484          
Monetary liabilities denominated in foreign currencies ₩ 18