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Borrowings - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
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
Current portion of noncurrent bills issued 94,798   3,169  
Unamortized discounts [member]        
Disclosure of detailed information about borrowings [line items]        
Long-term bills payable 4,635   $ 155 $ 768
Borrowings From Leasing Companies [Member]        
Disclosure of detailed information about borrowings [line items]        
Funding from subsidiaries $ 100,016 $ 3,344    
Borrowings maturity February 2021 February 2021    
Borrowings From Leasing Companies [Member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.02%   5.02%  
Borrowings From Leasing Companies [Member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 6.89%   6.89%  
Short Term Unsecured Revolving Bank Loan And Letters Of Credit [Member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 0.70%   0.70% 0.76%
Short Term Unsecured Revolving Bank Loan And Letters Of Credit [Member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.40%   5.40% 5.10%