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Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term benefits ₩ 2,762 ₩ 2,879 ₩ 2,629
Post-employment benefits 751 311 381
Stock-based compensation 878 1,331 1,237
Total ₩ 4,391 ₩ 4,521 ₩ 4,247