XML 209 R190.htm IDEA: XBRL DOCUMENT v3.21.1
Business Combinations - Summary of Goodwill Recognized on Acquisitions (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about business combination [Line Items]            
Ending balance of goodwill in respective year $ 54,777,439 $ 1,950,764 $ 50,198,436 $ 1,787,693 $ 49,974,446 $ 9,934,494
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          
Add: Fair value of investments previously owned 315,925          
Add: Non-controlling interests 416,716          
Less: Fair value of identifiable net assets acquired (849,863)          
Ending balance of goodwill in respective year 132,778          
ASEEE [member]            
Disclosure of detailed information about business combination [Line Items]            
Add: Fair value of investments previously owned 117,609          
Add: Non-controlling interests 105,464          
Less: Fair value of identifiable net assets acquired (215,233)          
Ending balance of goodwill in respective year 7,840          
USIPL [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 313,057          
Add: Non-controlling interests 142,494          
Less: Fair value of identifiable net assets acquired (331,192)          
Ending balance of goodwill in respective year 124,359          
FAFG [member]            
Disclosure of detailed information about business combination [Line Items]            
Total consideration 12,829,372 456,887        
Add: Non-controlling interests (5,635) (201)        
Less: Fair value of identifiable net assets acquired (8,198,468) (291,968)        
Ending balance of goodwill in respective year $ 4,625,269 $ 164,718