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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 324,551 $ 9,934,494 $ 10,490,309 $ 10,506,519
Impairment losses recognized     (425,117)  
Acquisition through business combinations 1,306,443 39,990,231   15,323
Effect of foreign currency exchange differences 1,624 49,721 (130,698) (31,533)
Ending balance 1,632,618 49,974,446 9,934,494 10,490,309
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 403,418 12,348,607 12,479,305 12,495,515
Acquisition through business combinations 1,306,443 39,990,231   15,323
Effect of foreign currency exchange differences 1,624 49,721 (130,698) (31,533)
Ending balance 1,711,485 52,388,559 12,348,607 12,479,305
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 78,867 2,414,113 1,988,996 1,988,996
Impairment losses recognized     425,117  
Ending balance $ 78,867 $ 2,414,113 $ 2,414,113 $ 1,988,996