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Inventories - Amount of the Inventory Write-downs Charged to the Consolidated Statement of Income and Write-off of Inventories (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Classes of current inventories [abstract]      
Charged to cost of products that have been resold ₩ 2,297 ₩ (3,287) ₩ (1,560)
Write-off upon sale ₩ (756) ₩ (347) ₩ (3,312)