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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 49,974,446 $ 1,670,827 $ 9,934,494 $ 10,490,309
Impairment losses recognized       (425,117)
Acquisition through business combinations 264,977 8,859 39,990,231  
Effect of foreign currency exchange differences (40,987) (1,370) 49,721 (130,698)
Ending balance 50,198,436 1,678,316 49,974,446 9,934,494
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 52,388,559 1,751,540 12,348,607 12,479,305
Acquisition through business combinations 264,977 8,859 39,990,231  
Effect of foreign currency exchange differences (40,987) (1,370) 49,721 (130,698)
Ending balance 52,612,549 1,759,029 52,388,559 12,348,607
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 2,414,113 80,713 2,414,113 1,988,996
Impairment losses recognized       425,117
Acquisition through business combinations   0    
Effect of foreign currency exchange differences   0    
Ending balance $ 2,414,113 $ 80,713 $ 2,414,113 $ 2,414,113