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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, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 11,805,505 $ 9,131,814 $ 394,701
Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Holding company and the group engaged in manufacturing, development and marketing of wafer level packaging and interconnect technology    
Operating Location British Cayman Islands    
Percentages of ownership held by the Group 22.02% 22.04%  
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%  
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 20.48% 20.47%  
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 32.21% 32.21%  
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%    
Advanced Microelectronic Products Inc AMPI [Member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in the manufacturing of integrated circuit    
Operating Location R.O.C.    
Percentages of ownership held by the Group   38.76%  
Cost [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land $ 12,105,654 $ 9,431,963 404,736
Cost [member] | Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 323,423 866,312 10,813
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 1,380,162 1,095,233 46,144
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 283,105 295,772 9,465
Cost [member] | ChipMOS Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land 4,370,075 4,237,982 146,108
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 3,934,190 2,752,530 131,534
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 1,814,699   60,672
Cost [member] | Advanced Microelectronic Products Inc AMPI [Member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates before deferred gain on transfer of land   184,134  
Deferred gain on transfer of land [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 300,149 $ 300,149 $ 10,035