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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
 1 Months Ended 12 Months Ended
Jul. 31, 2016
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2017
USD ($)
Disclosure of associates and joint ventures [line items]        
Investments in associates   $ 48,267,237 $ 49,154,140 $ 1,628,449
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   ROC    
Percentages of ownership held by the Group   33.29% 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    
Investments in associates     $ 1,813,677  
Percentages of ownership held by the Group 22.07% 22.04% 22.07%  
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   ROC    
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   ROC    
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   ROC    
Investments in associates     $ 264,434  
Percentages of ownership held by the Group   38.76% 38.76%  
Cost [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   $ 48,567,386 $ 49,454,289 1,638,576
Cost [member] | Siliconware Precision Industries Co., Ltd. [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   45,210,371 45,898,225 1,525,316
Cost [member] | Deca Technologies Inc. [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   1,583,124 1,813,677 53,412
Cost [member] | Hung Ching Development & Construction Co. [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   1,248,711 1,156,833 42,129
Cost [member] | Hung Ching Kwan Co. [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   309,630 321,120 10,447
Cost [member] | Advanced Microelectronic Products Inc. [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   215,550 264,434 7,272
Deferred gain on transfer of land [member]        
Disclosure of associates and joint ventures [line items]        
Investments in associates   $ 300,149 $ 300,149 $ 10,127