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Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term benefits ₩ 2,879 ₩ 2,629 ₩ 2,455
Post-employment benefits 311 381 413
Stock-based compensation 1,331 1,237 997
Total ₩ 4,521 ₩ 4,247 ₩ 3,865