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Property, Plant and Equipment - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [line items]    
Borrowing cost capitalized ₩ 8,473 ₩ 16,451
Bottom of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Interest rate of capitalized borrowing cost 3.37% 2.29%
Top of range [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Interest rate of capitalized borrowing cost 3.54% 3.50%