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Borrowings - Summary of Bills Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable $ 10,895,365 $ 364,272 $ 3,099,232
Unamortized Discounts [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 4,635 155 768
Longterm Bills Payable [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 10,900,000 364,427 3,100,000
China Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 2,800,000 93,614 1,000,000
International Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 3,000,000 100,301 1,000,000
Ta Ching Bills Finance Corporation [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable 3,100,000 103,644 $ 1,100,000
Mega Bills Finance Corporation [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term bills payable $ 2,000,000 $ 66,868