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Investments Accounted for Using the Equity Method - Summary of Investments in Associates Accounted for Using the Equity Method (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 20,410,983 $ 19,662,937 $ 622,476
Yann Yuan Investment Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in investing activities    
Operating Location R.O.C.    
Investments in associates before deferred gain on transfer of land $ 10,317,044 $ 10,250,888 314,640
Percentages of ownership held by the Group 27.94% 27.94%  
ChipMOS Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the packaging and testing of semiconductors    
Operating Location R.O.C.    
Investments in associates before deferred gain on transfer of land $ 2,941,982 $ 2,786,339 89,722
Percentages of ownership held by the Group 10.85% 10.85%  
Hung Ching Development & Construction Co. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the development, construction and leasing of real estate properties    
Operating Location R.O.C.    
Investments in associates before deferred gain on transfer of land $ 2,412,818 $ 2,035,230 73,584
Percentages of ownership held by the Group 26.22% 26.22%  
M-Universe Investments Pte. Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Investment company    
Operating Location Singapore    
Investments in associates before deferred gain on transfer of land $ 2,325,475 $ 2,072,314 70,920
Percentages of ownership held by the Group 42.23% 42.23%  
MACHVISION Inc [Member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the manufacturing and trading of non-contact optical inspection equipment    
Operating Location R.O.C.    
Investments in associates before deferred gain on transfer of land $ 2,055,590 $ 2,123,368 62,690
Percentages of ownership held by the Group 23.08% 23.08%  
CHIPLETZ [Member]      
Disclosure of associates and joint ventures [line items]      
Main Business Fabless substrate design house    
Operating Location U.S.A.    
Percentages of ownership held by the Group 18.74% 19.43%  
Hung Ching Kwan Co. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the leasing of real estate properties    
Operating Location R.O.C.    
Percentages of ownership held by the Group 27.31% 27.31%  
QUESTYLE [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the research and development on technology and sales of electronic products, digital products, audio equipment and spare parts, domestic trading; import and export business    
Operating Location China    
Percentages of ownership held by the Group 6.67% 6.67%  
Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Holding company with group engaged in the development of wafer level packaging    
Operating Location U.S.A.    
Percentages of ownership held by the Group 17.84% 17.84%  
Goodcare Holdings Inc [Member]      
Disclosure of associates and joint ventures [line items]      
Main Business Holding company, engaged in operation investment, long-term care and home services business    
Operating Location R.O.C.    
Percentages of ownership held by the Group 49.00% 49.00%  
Cost [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 20,327,885 $ 19,595,234 619,942
Cost [member] | CHIPLETZ [Member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 255,384 248,209 7,788
Cost [member] | Hung Ching Kwan Co. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land (83,098) (67,703) (2,534)
Cost [member] | QUESTYLE [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 17,798 72,421 543
Cost [member] | Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 58,100 53,357 1,772
Cost [member] | Goodcare Holdings Inc [Member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 26,792 20,811 817
Deferred gain on transfer of land [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 83,098 $ 67,703 $ 2,534