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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements of Level 3 (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about financial instruments [Line Items]        
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) $ (48,101) $ (1,467) $ (39,254) $ 69,404
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income (17,304) $ (528) (217,785) (46,419)
Level 3 [member] | Equity instruments [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Movement of financial instruments beginning balance 120,317   338,102  
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income (17,304)   (217,785)  
Purchases     12,500  
Reclassified as investments accounted for using equity method     (12,500)  
Movement of financial instruments ending balance $ 103,013   $ 120,317 $ 338,102