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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance $ 15,034,220    
Financial assets ending balance 17,987,228 $ 15,034,220  
Contract assets [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (229) (120) $ (117)
Provision for impairment loss   (109) (3)
Reversal of impairment loss 55    
Financial assets ending balance (174) (229) (120)
Accounts receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (2,669) (1,910) (1,620)
Provision for impairment loss   (759) (290)
Reversal of impairment loss 215    
Financial assets ending balance (2,454) (2,669) (1,910)
Other receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (45) (16) (10)
Provision for impairment loss   (29) (6)
Reversal of impairment loss 32    
Financial assets ending balance $ (13) $ (45) $ (16)