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Share Capital and Capital Surplus - Summary of Share Capital (Detail) - KRW (₩) | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of classes of share capital [abstract] |  |  |
Authorized shares | 200,000,000 | 200,000,000 |
Par value | ₩ 5,000 | ₩ 5,000 |
Issued shares | 80,932,952 | 82,624,377 | 84,571,230
Shared capital | ₩ 482,403,125,000 | ₩ 482,403,125,000 |

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