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Operating Segment Information - Individual Customers Accounting for at least 10% of Operating Revenues (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of Major Customers [Line Items]        
Operating revenues $ 222,533,000 $ 7,267,570 $ 278,705,264 $ 213,011,018
Customer concentration risk [member] | Wafer fabrication [member] | Customer A [member]        
Disclosure of Major Customers [Line Items]        
Operating revenues 16,615,745   24,061,849 21,935,208
Customer concentration risk [member] | Wafer fabrication [member] | Customer B [member]        
Disclosure of Major Customers [Line Items]        
Operating revenues $ 29,242,973   $ 22,226,167 $ 14,707,370