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Long-term Bank Loans - Summary of Long-term Bank Loans (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of detailed information about borrowings [Line Items]      
Syndicated bank loan $ 9,041,645 $ 9,789,518  
Less:Fee on syndicated bank loan (24,355) (32,482)  
Less: Current portion (fee included) (748,419) (747,422) $ (25,023)
Syndicated bank loans, excluding current portion 8,293,226 9,042,096 $ 277,273
Long-term bank loans [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Unused credit lines of long-term bank loans $ 1,800,000 $ 1,800,000  
Gross carrying amount [member]      
Disclosure of detailed information about borrowings [Line Items]      
Interest rate range 1.7895% 1.7895% 1.7895%
Gross carrying amount [member] | Syndicated bank loans repayable from November 2018 to May 2023 [member]      
Disclosure of detailed information about borrowings [Line Items]      
Syndicated bank loan $ 9,066,000 $ 9,822,000  
Period and payment term Borrowing period is from May 30, 2018 to May 30, 2023; interest is repayable monthly; principal is repayable semi-annually from November 30, 2018 Borrowing period is from May 30, 2018 to May 30, 2023; interest is repayable monthly; principal is repayable semi-annually from November 30, 2018