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Summary of Significant Accounting Policies - Additional Information (Detail) - KRW (₩)
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [Line Items]      
Financial liabilities measured at FVTPL     ₩ 0
Reclassified inventories to property plant and equipment   ₩ 111,456  
Impact of IFRS 16 Leases [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Impact of consolidated financial statements after adoption of IFRS 16   1.00%  
Initial Adoption of IFRS 9 [member] | Retained earnings [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Impact on opening balance of retained earnings ₩ 0    
Mask and Mold [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Estimated useful lives of the assets   P2Y