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Inventories - Summary of Inventories Net (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of inventories [line items]    
Inventories ₩ 642,027 ₩ 454,588
Merchandise [member]    
Disclosure of inventories [line items]    
Inventories 446,028 357,304
Others [member]    
Disclosure of inventories [line items]    
Inventories 195,999 97,284
Gross carrying amount [member]    
Disclosure of inventories [line items]    
Inventories 700,320 501,716
Gross carrying amount [member] | Merchandise [member]    
Disclosure of inventories [line items]    
Inventories 504,321 403,938
Gross carrying amount [member] | Others [member]    
Disclosure of inventories [line items]    
Inventories 195,999 97,778
Valuation allowance [member]    
Disclosure of inventories [line items]    
Inventories (58,293) (47,128)
Valuation allowance [member] | Merchandise [member]    
Disclosure of inventories [line items]    
Inventories ₩ (58,293) (46,634)
Valuation allowance [member] | Others [member]    
Disclosure of inventories [line items]    
Inventories   ₩ (494)