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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 52,709,053 $ 1,900,110 $ 50,198,436 $ 49,974,446
Acquisition through business combinations     2,567,842 264,977
Disposal of subsidiaries (310,711) (11,201)    
Effect of foreign currency exchange differences (325,929) (11,749) (57,225) (40,987)
Ending balance 52,072,413 1,877,160 52,709,053 50,198,436
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 55,123,166 1,987,136 52,612,549 52,388,559
Acquisition through business combinations     2,567,842 264,977
Disposal of subsidiaries (310,711) (11,201)    
Effect of foreign currency exchange differences (325,929) (11,749) (57,225) (40,987)
Ending balance 54,486,526 1,964,186 55,123,166 52,612,549
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 2,414,113 87,026 2,414,113 2,414,113
Ending balance $ 2,414,113 $ 87,026 $ 2,414,113 $ 2,414,113