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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements in Relation to Loss Allowance for Contract Assets, Accounts Receivable and Other Receivables (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance $ 17,987,228    
Financial assets ending balance 20,587,762 $ 17,987,228  
Contract assets [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (174) (229) $ (120)
Provision for impairment loss     (109)
Reversal of impairment loss 55 55  
Financial assets ending balance (119) (174) (229)
Accounts receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (2,454) (2,669) (1,910)
Provision for impairment loss     (759)
Reversal of impairment loss 964 215  
Financial assets ending balance (1,490) (2,454) (2,669)
Other receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (13) (45) (16)
Provision for impairment loss     (29)
Reversal of impairment loss 1 32  
Financial assets ending balance $ (12) $ (13) $ (45)