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Earnings per Share - Summary of Basic and Diluted Earnings per Share from Operations (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per share [abstract]
Profit (loss) attributable to ordinary shares	₩ 649,109	₩ 645,571	₩ 461,559
Weighted average number of ordinary shares outstanding	245,171,283	245,049,466	245,017,175
Basic earnings per share (In Korean won)	₩ 2,648	₩ 2,634	₩ 1,884
Profit attributable to ordinary shares (In millions of Korean won)	₩ 649,109	₩ 645,571	₩ 461,559
Adjustment to net income attributable to ordinary shares (In millions of Korean won)	(157)
Diluted profit attributable to ordinary shares (In millions of Korean won)	₩ 648,952	₩ 645,571	₩ 461,559
Number of dilutive potential ordinary shares outstanding	70,267	1,163	79,880
Weighted average number of ordinary shares outstanding	245,241,550	245,050,629	245,097,055
Diluted earnings per share (In Korean won)	₩ 2,646	₩ 2,634	₩ 1,883

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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