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Accounts receivable - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Jan. 01, 2023
TWD ($)
Disclosure of financial assets [Line Items]        
Accounts receivable, net $ 5,326,381 $ 5,010,154 $ 152,795  
Accounts receivable [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable, net $ 5,328,835 $ 5,011,644   $ 4,381,563
Bottom of range [member]        
Disclosure of financial assets [Line Items]        
Credit term granted to customers 30 days      
Top of range [member]        
Disclosure of financial assets [Line Items]        
Credit term granted to customers 90 days