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Profit Before Income Tax - Summary of Employees' Compensation and Remuneration to Directors (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Analysis Of Income And Expense [line items]        
Percentage of employees' compensation 0.25% 0.25% 0.25%  
Employees' compensation $ 81,113 $ 2,474 $ 79,385  
Percentage of remuneration to directors 0.25% 0.25% 0.40%  
Remuneration to directors $ 79,947 $ 2,438 $ 127,016  
Resolved by the board of directors [member]        
Analysis Of Income And Expense [line items]        
Employees' compensation     79,450 $ 155,463
Remuneration to directors     125,000 247,000
Recognized in the consolidated financial statements [member]        
Analysis Of Income And Expense [line items]        
Employees' compensation     79,385 155,398
Remuneration to directors     $ 127,016 $ 248,637