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Lease - Summary of Changes in Right-of-Use Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance ₩ 4,946 ₩ 4,453
Depreciation (2,957) (2,135)
Additions 3,784 2,637
Removal (13) (15)
Translation differences (23) 6
Ending balance 5,737 4,946
Offices    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 3,642 2,752
Depreciation (1,493) (901)
Additions 1,780 1,791
Translation differences (25)  
Ending balance 3,904 3,642
Vehicles    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 266 53
Depreciation (186) (92)
Additions 36 320
Removal (13) (15)
Translation differences (1)  
Ending balance 102 266
Others    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 1,038 1,648
Depreciation (1,278) (1,142)
Additions 1,968 526
Translation differences 3 6
Ending balance ₩ 1,731 ₩ 1,038