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Business Combinations - Summary of Goodwill Recognized on Acquisitions (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about business combination [Line Items]            
Ending balance of goodwill in respective year $ 50,198,436 $ 1,678,316 $ 49,974,446 $ 1,670,827 $ 9,934,494 $ 10,490,309
SPIL [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 168,440,585          
Add: Non-controlling interests 3,582,866          
Less: Fair value of identifiable net assets acquired (132,033,220)          
Ending balance of goodwill in respective year 39,990,231          
AMPI [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 250,000 8,358        
Add: Fair value of investments previously owned 315,925 10,563        
Add: Non-controlling interests 416,716 13,932        
Less: Fair value of identifiable net assets acquired (849,863) (28,414)        
Ending balance of goodwill in respective year 132,778 4,439        
ASEEE [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 0 0        
Add: Fair value of investments previously owned 117,609 3,932        
Add: Non-controlling interests 105,464 3,526        
Less: Fair value of identifiable net assets acquired (215,233) (7,196)        
Ending balance of goodwill in respective year 7,840 262        
UGPL [Member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 313,057 10,467        
Add: Non-controlling interests 142,494 4,764        
Less: Fair value of identifiable net assets acquired (331,192) (11,073)        
Ending balance of goodwill in respective year $ 124,359 $ 4,158