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Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Dividends [abstract]
Dividends paid	₩ 195,977	₩ 122,425	₩ 0
Dividends paid per share	₩ 800	₩ 500
Dividends declared	₩ 245,097
Dividends declared per share	₩ 1,000

X

- Definition

The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]

+ References

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- Definition

The amount of dividends paid per ordinary share.

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- Definition

The amount of dividends proposed or declared after the reporting period but before financial statements are authorised for issue. Such dividends are not recognised as a liability at the end of the reporting period because no obligation exists at that time.

+ References

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- Definition

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- Definition

Disclosure of dividends.

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No definition available.

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