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Related Party Transactions - Summary of Significant Transactions between the Company and Other Related Parties (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2017
USD ($)
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods $ 8,496.1 $ 5,929.1 $ 4,255.2  
Receivables from related parties 1,184.1 969.5   $ 39.9
Payables to related parties 1,656.4 1,262.2    
Other receivables from related parties 171.1 146.8   $ 5.8
Manufacturing expenses 2,196.1 1,389.2 2,334.7  
Research and development expenses 69.8 161.7 144.2  
Global Unichip Corporation [member]        
Disclosure of transactions between related parties [line items]        
Receivables from related parties 1,022.9 969.1    
Xintec Inc. [member]        
Disclosure of transactions between related parties [line items]        
Receivables from related parties 161.2 0.4    
Payables to related parties 817.9 124.6    
Systems on Silicon Manufacturing Company Pte Ltd. [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 407.0 506.1    
Other receivables from related parties 83.1 60.7    
Vanguard International Semiconductor Corporation [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 410.0 587.4    
Other receivables from related parties 78.2 86.0    
Associates [member]        
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods 8,496.0 5,929.1 4,254.0  
Net revenue from royalties 482.5 516.7 489.4  
Related Party Categories 9,904.6 10,108.2 11,126.4  
Acquisition of property, plant and equipment     26.2  
Manufacturing expenses 2,196.1 1,389.2 2,321.9  
Research and development expenses 69.8 161.7 142.8  
Joint venture [member]        
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods 0.1      
Manufacturing expenses     12.8  
Research and development expenses     1.4  
Other related parties [member]        
Disclosure of transactions between related parties [line items]        
Net revenue from sale of goods     1.2  
General and administrative expenses 101.5 60.0 $ 60.0  
Other associates [member]        
Disclosure of transactions between related parties [line items]        
Payables to related parties 21.5 44.1    
Other receivables from related parties $ 9.8 $ 0.1