Investments in Equity Accounted Investees - Reconciliation from Financial Information of Significant Associate to its Carrying Value in Consolidated Financial Statements (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of associates [Line Items]
Book value	₩ 84,329	₩ 109,119	₩ 126,719
Paju Electric Glass Co., Ltd. [member]
Disclosure of associates [Line Items]
Net asset	₩ 62,117	₩ 107,666
Ownership interest	40.00%	40.00%
Net asset (applying ownership interest)	₩ 24,847	₩ 43,066
Intra-group transaction	(647)	(282)
Book value	₩ 24,200	₩ 42,784	₩ 48,398