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Accounts receivable - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Jan. 01, 2020
TWD ($)
Disclosure of financial assets [Line Items]        
Accounts receivable from contract with customers $ 6,344,246 $ 228,704 $ 5,364,156  
Accounts receivable [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable from contract with customers $ 6,346,156   $ 5,365,776 $ 4,452,904
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