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Borrowings - Additional Information (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Unsecured revolving bank loans [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rates 0.80% 0.80% 0.70%
Unsecured revolving bank loans [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rates 4.79% 4.79% 8.99%
Longterm bank loans with fixed interest rates [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rates 1.20% 1.20% 1.20%
Long term bank loans with fixed interest rates $ 1,500,000 $ 50,607 $ 1,500,000