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Share Capital and Capital Surplus - Summary of Share Capital (Detail) - KRW (₩)
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
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