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Non-cash Transactions - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
TWD ($)
Disclosure Of Non Cash Investing Activities [Line Items]      
Issue of ordinary shares under conversion of bonds $ 13,900,482   $ 214,022
Share capital [member]      
Disclosure Of Non Cash Investing Activities [Line Items]      
Issue of ordinary shares under conversion of bonds 4,242,577 $ 143,137  
Capital surplus [member]      
Disclosure Of Non Cash Investing Activities [Line Items]      
Issue of ordinary shares under conversion of bonds $ 9,657,905 $ 325,840 $ 214,022