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Selling and Administrative Expenses - Summary of Selling Expenses (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Statement of comprehensive income [Line Items] |  |  |
Freight and custody | ₩ 2,444,069 | ₩ 2,594,589 | ₩ 2,297,544
Sales commissions | 94,092 | 102,114 | 68,138
Total Selling expenses | 244,175 | 234,888 | 233,579
Selling expenses [member] |  |  |
Statement of comprehensive income [Line Items] |  |  |
Freight and custody | 31,038 | 34,554 | 55,531
Operating expenses for distribution center | 618 | 1,995 | 4,534
Sales commissions | 94,092 | 102,114 | 68,138
Sales advertising | 1,632 | 4,304 | 4,083
Sales promotion | 10,729 | 9,887 | 9,503
Sample | 2,181 | 2,436 | 2,234
Sales insurance premium | 34,606 | 32,139 | 31,622
Contract cost | 52,808 | 35,124 | 46,140
Others | 16,471 | 12,335 | 11,794
Total Selling expenses | ₩ 244,175 | ₩ 234,888 | ₩ 233,579

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