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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, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 16,500,670 $ 12,335,239 $ 594,833
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.    
Percentages of ownership held by the Group 29.45% 32.21%  
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.    
Percentages of ownership held by the Group 10.85% 10.85%  
M-Universe Investments Pte. Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Investment company    
Operating Location Singapore    
Percentages of ownership held by the Group 42.23% 42.23%  
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.    
Percentages of ownership held by the Group 26.22% 26.22%  
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%  
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 and interconnect technology    
Operating Location U.S.A.    
Percentages of ownership held by the Group 17.85% 17.85%  
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 20.82%    
Cost [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land $ 16,800,819 $ 12,635,388 605,653
Cost [member] | Yann Yuan Investment Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 9,873,978 6,670,035 355,947
Cost [member] | ChipMOS Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 2,717,250 2,406,843 97,954
Cost [member] | M-Universe Investments Pte. Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 1,859,542 1,848,588 67,035
Cost [member] | Hung Ching Development & Construction Co. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 1,828,921 1,352,760 65,931
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 258,757 270,087 9,328
Cost [member] | Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 51,434 87,075 1,854
Cost [member] | CHIPLETZ [Member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 210,937   7,604
Deferred gain on transfer of land [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 300,149 $ 300,149 $ 10,820