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Goodwill - Summary of Goodwill (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance $ 10,490,309 $ 353,924 $ 10,506,519 $ 10,445,415
Acquisitions through business combinations (retrospectively adjusted)     15,323  
Impairment losses recognized (425,117) (14,343)    
Effect of foreign currency exchange differences (130,698) (4,409) (31,533) 61,104
Ending balance 9,934,494 335,172 10,490,309 10,506,519
Cost [member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 12,479,305 421,029 12,495,515 12,434,411
Acquisitions through business combinations (retrospectively adjusted)     15,323  
Effect of foreign currency exchange differences (130,698) (4,409) (31,533) 61,104
Ending balance 12,348,607 416,620 12,479,305 12,495,515
Accumulated impairment [Member]        
Disclosure of reconciliation of changes in goodwill [line items]        
Beginning balance 1,988,996 67,105 1,988,996 1,988,996
Impairment losses recognized 425,117 14,343    
Ending balance $ 2,414,113 $ 81,448 $ 1,988,996 $ 1,988,996