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Financial Instruments - Value Measurement Method and Significant but not Observable Inputs for the Financial Assets Classified as Fair Value Hierarchy Level 3 (Detail) - Fair value [member] - Level 3 [member]
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Volatility 45 45
Bottom of range [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Growth rate 0.00%  
Discount rate 6.00% 6.00%
Price multiple 0  
Top of range [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Growth rate 1.00%  
Discount rate 13.00% 13.00%
Price multiple 37.765  
Discounted cash flow [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Available-for-sale financial assets ₩ 524,552  
Proxy firm valuation method [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Available-for-sale financial assets 51,734  
Binomial Option Pricing Model [Member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Available-for-sale financial assets 93,831 $ 1,827,288
Asset value approach [member]    
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]    
Available-for-sale financial assets ₩ 589,174