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Capital stock - Additional Information (Detail)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
TWD ($)
shares
Dec. 31, 2020
shares
Disclosure of classes of share capital [line items]        
Ordinary shares par value | $ / shares $ 10      
Number of shares outstanding 727,240,000 727,240,000 727,240,000 727,240,000
Authorised capital | $ $ 9,700,000      
Number of shares authorized 970,000,000 970,000,000    
Paid in capital $ 7,272,401 $ 236,655 $ 7,272,401  
Ordinary shares [member]        
Disclosure of classes of share capital [line items]        
Number of shares outstanding 88,195,000 88,195,000    
American depositary shares [member]        
Disclosure of classes of share capital [line items]        
Number of shares represented by each unit of ADS 20      
Number of shares outstanding 4,409,752 4,409,752