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Capital stock - Additional Information (Detail)
$ / shares in Units, $ in Thousands, $ in Thousands
 12 Months Ended
Aug. 06, 2019
TWD ($)
shares
Mar. 07, 2019
TWD ($)
shares
Dec. 31, 2021
TWD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
TWD ($)
Disclosure of classes of share capital [line items]          
Ordinary shares par value | $ / shares     $ 10    
Number of shares outstanding     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 $ 262,163 $ 7,272,401
Approval for number of treasury stock cancelled 25,570,000 25,570,000      
Cancellation of treasury stock | $ $ 962,503 $ 962,503      
Ordinary shares [member]          
Disclosure of classes of share capital [line items]          
Number of shares outstanding     91,725,000 91,725,000  
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     4,586,252 4,586,252