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Share-based Payments - Summary of Details of Share-based Payments (Detail) - KRW (₩)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Grant date July 27, 2017  
Vesting conditions Service condition: 1 year Non-marketperformance condition: achievement of performance  
Fair value per option ₩ 34,400  
Total compensation costs ₩ 6,483,000,000 ₩ 5,762,000,000