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Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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)

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