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Intangible Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]
Indefinite useful life	₩ 238,053	₩ 268,350
Impairment losses recognized on indefinite-lived intangible assets	116,095	₩ 135,264	₩ 292,345
Satellite TV [member]
Disclosure of detailed information about intangible assets [line items]
Impairment losses recognized on goodwill	78,200
Impairment losses recognized on indefinite-lived intangible assets	₩ 29,325
Expected growth rate	0.00%
Estimated revenue growth rate	(0.77%)
Discount rate	13.25%

X

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

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The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill]

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The amount of intangible assets assessed as having an indefinite useful life. [Refer: Intangible assets other than goodwill]

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Revenue growth rates.

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