v3.26.1
Significant Assets and Liabilities Denominated in Foreign Currencies - Summary of Significant Assets and Liabilities Denominated in Foreign Currencies (Detail)
¥ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
Dec. 31, 2025
USD ($)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JPY (¥)
Disclosure of detailed information about financial instruments [line items]              
Financial liabilities $ 396,607     $ 12,643      
US Dollar [member] | US dollar equals to New Taiwan dollar [member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets 245,996,086 $ 198,312,976   7,826,792   $ 6,048,894  
Financial liabilities $ 243,685,945 $ 194,106,411   7,753,291   5,920,586  
Exchange Rate US$1=NT$31.430 US$1=NT$32.785 US$1=NT$30.705        
Exchange Rate US$1=NT$31.430 US$1=NT$32.785 US$1=NT$30.705        
US Dollar [member] | US dollar equals to Chinese yuan [member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets $ 45,346,978 $ 53,404,267   1,442,793   1,628,924  
Financial liabilities $ 36,794,998 $ 30,668,260   1,170,697   935,436  
Exchange Rate US$1=RMB7.0288 US$1=RMB7.1884          
Exchange Rate US$1=RMB7.0288 US$1=RMB7.1884          
US Dollar [member] | Us Dollar Equals To Euro [Member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets $ 1,620,718 $ 2,139,276   51,566   65,252  
Financial liabilities $ 1,437,230 $ 1,151,894   $ 45,728   $ 35,135  
Exchange Rate US$1=EUR0.8511 US$1=EUR0.9626          
Exchange Rate US$1=EUR0.8511 US$1=EUR0.9626          
Japanese Yen [Member] | Japanese yen equals to New Taiwan dollar [member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets $ 2,646,231 $ 1,806,027     ¥ 13,178,438   ¥ 8,604,226
Financial liabilities $ 4,960,770 $ 1,979,374     24,705,027   9,430,081
Exchange Rate JPY1=NT$0.2008 JPY1=NT$0.2099          
Exchange Rate JPY1=NT$0.2008 JPY1=NT$0.2099          
Japanese Yen [Member] | Japanese Yen Equals To Chinese Yuan [Member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets $ 37,344       185,975    
Financial liabilities $ 452,709       2,254,526    
Exchange Rate JPY1=RMB0.0449            
Exchange Rate JPY1=RMB0.0449            
Japanese Yen [Member] | Japanese yen equals to US dollar [member]              
Disclosure of detailed information about financial instruments [line items]              
Financial assets $ 62,972 $ 49,716     313,605   236,858
Financial liabilities $ 204,984 $ 335,530     ¥ 1,020,834   ¥ 1,598,522
Exchange Rate JPY1=US$0.0064 JPY1=US$0.0064          
Exchange Rate JPY1=US$0.0064 JPY1=US$0.0064