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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance $ 10,131,324    
Financial assets ending balance 13,170,873 $ 10,131,324  
Contract assets [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (117) (114) $ (135)
Provision for impairment loss (3) (3)  
Reversal of impairment loss     21
Financial assets ending balance (120) (117) (114)
Accounts receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (1,620) (1,351) (2,141)
Provision for impairment loss (290) (269)  
Reversal of impairment loss     790
Financial assets ending balance (1,910) (1,620) (1,351)
Other receivable including related parties [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Financial assets beginning balance (10) (18) (13)
Provision for impairment loss (6)   (5)
Reversal of impairment loss   8  
Financial assets ending balance $ (16) $ (10) $ (18)