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Earning Per Share - Summary of Diluted Earnings Per Share (Detail) - KRW (₩)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings per share [abstract]
Profit attributable to controlling interest	₩ 690,685,596,779	₩ 1,125,379,754,922	₩ 1,698,202,436,726
Gain from exchange rate on and revaluation of exchangeable bonds	0	(139,569,768,850)	0
Diluted profit	₩ 690,685,596,779	₩ 985,809,986,072	₩ 1,698,202,436,726
Adjusted weighted-average number of common shares	75,620,779	77,990,432	75,869,542
Diluted earnings per share	₩ 9,134	₩ 12,640	₩ 22,383

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- 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]]

+ References

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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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- Definition

The profit (loss) attributable to ordinary equity holders of the parent entity, adjusted for the effects of all dilutive potential ordinary shares. [Refer: Profit (loss)]

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Gain loss from exchange rate on and revaluation of exchageable bonds.

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