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Accounts receivable - Summary of Accounts and notes receivable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Jan. 01, 2019
TWD ($)
Disclosure of financial assets [Line Items]        
Accounts receivable $ 5,364,156 $ 191,031 $ 4,452,904  
Accounts receivable [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable 5,365,776   4,454,255 $ 4,745,693
Loss allowance [member]        
Disclosure of financial assets [Line Items]        
Accounts receivable $ (1,620)   $ (1,351)