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Contents of Significant Accounts - Summary of Disaggregation of Revenue by Geography (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers $ 222,533,000 $ 278,705,264 $ 213,011,018
Taiwan [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 68,360,231 105,213,451 92,427,670
China (includes Hong Kong) [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 27,545,452 39,641,613 26,949,205
Japan [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 11,612,866 17,053,279 13,445,127
Korea [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 30,872,198 25,689,385 17,548,763
USA [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 59,103,051 67,352,671 46,914,605
Europe [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers 24,932,099 23,711,284 15,708,303
Others [member]      
Disclosure of Geographical Areas [Line Items]      
Revenue from contracts with customers $ 107,103 $ 43,581 $ 17,345