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Employee benefit expenses - Additional Information (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [Line Items]      
Accrued Employee Compensation $ 186,484 $ 250,181 $ 447,303
Accrued Directors remuneration $ 4,662 $ 6,255 $ 11,182
Defined benefit pension plan [Member]      
Disclosure of defined benefit plans [Line Items]      
Employees' compensation distribution rate 10.00%    
Director remuneration rate no more than 0.50%