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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, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 298,328 $ 48,267,237 $ 9,131,814
Siliconware Precision Industries Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in assembly, testing and turnkey services of integrated circuits    
Operating Location R.O.C.    
Percentages of ownership held by the Group   33.29%  
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 22.04% 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%  
Advanced Microelectronic Products Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Main Business Engaged in integrated circuit    
Operating Location R.O.C.    
Percentages of ownership held by the Group 38.76% 38.76%  
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 20.47%    
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%    
Cost [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 308,134 $ 48,567,386 9,431,963
Cost [member] | Siliconware Precision Industries Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates   45,210,371  
Cost [member] | Deca Technologies Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 28,302 1,583,124 866,312
Cost [member] | Hung Ching Development & Construction Co. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 35,780 1,248,711 1,095,233
Cost [member] | Hung Ching Kwan Co. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 9,663 309,630 295,772
Cost [member] | Advanced Microelectronic Products Inc. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 6,015 215,550 184,134
Cost [member] | ChipMos Technologies Inc [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 138,451   4,237,982
Cost [member] | Yann Yuan Investment Co., Ltd. [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates 89,923   2,752,530
Deferred gain on transfer of land [member]      
Disclosure of associates and joint ventures [line items]      
Investments in associates $ 9,806 $ 300,149 $ 300,149