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Borrowings - Summary of Long-term Bills Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable $ 101,249 $ 3,099,232 $ 1,999,132
Unamortized Discounts [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 25 768 868
Longterm Bills Payable [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 101,274 3,100,000 2,000,000
China Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 32,669 1,000,000 1,000,000
International Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 32,669 1,000,000 $ 1,000,000
Ta Ching Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable $ 35,936 $ 1,100,000