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Long-term Bank Loans - Summary of Long-term Bank Loans (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [Line Items]      
Bank loans $ 9,413,365 $ 7,733,565  
Less:Fee on syndicated bank loan (10,026) (17,223)  
Less: Unamortized interest on government granted bank loans (93,740) (64,212)  
Less: Current portion (fee included) (46,826) (748,353) $ (1,688)
Syndicated bank loans, excluding current portion 9,366,539 6,985,212 $ 337,655
Long-term bank loans [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Unused credit lines of long-term bank loan $ 8,776,868 $ 11,239,000  
Gross carrying amount [member] | Minimum [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Interest rate range 0.45% 0.65% 0.45%
Gross carrying amount [member] | Maximum [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]      
Bank loans $ 54,000 $ 3,310,000  
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    
Gross carrying amount [member] | Government granted bank loans from March 2020 To November 2031 [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Bank loans $ 9,463,131 $ 4,505,000  
Period and payment term Borrowing period is from March 11, 2020 to November 15, 2031; interest is repayable monthly; principal is repayable monthly from March 15, 2023