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Contents of Significant Accounts - Details of Long-term Loans (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 22,883,344   $ 19,279,342
Less: Current portion (2,227,096)   (2,485,053)
Total 20,656,248 $ 674,600 16,794,289
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 22,883,344   $ 19,279,342
Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Interest rates applied 1.67% 1.67% 1.48%
Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Interest rates applied 6.56% 6.56% 5.62%
Secured Long-Term Loan from Mega International Commercial Bank (1) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from October 24, 2019 to October 24, 2024 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Mega International Commercial Bank (1) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,866   $ 9,732
Secured Long-Term Loan from Mega International Commercial Bank (2) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from February 23, 2022 to February 22, 2027 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Mega International Commercial Bank (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 13,765   18,000
Secured Long-Term Loan from Taiwan Cooperative Bank (1) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from October 19, 2015 to October 19, 2025 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Taiwan Cooperative Bank (1) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 23,784   35,676
Secured Long-Term Loan from Taiwan Cooperative Bank (2) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from May 31, 2019 to May 31, 2023 with monthly interest payments.    
Secured Long-Term Loan from Taiwan Cooperative Bank (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 0   4,375
Secured Long-Term Loan from Taiwan Cooperative Bank (3) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from August 13, 2020 to August 13, 2025 with monthly interest payments.    
Secured Long-Term Loan from Taiwan Cooperative Bank (3) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 20,000   32,000
Secured Long-Term Loan from Taiwan Cooperative Bank (4) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from October 29, 2020 to August 29, 2025 with monthly interest payments.    
Secured Long-Term Loan from Taiwan Cooperative Bank (4) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 10,345   16,552
Secured Long-Term Loan from Taiwan Cooperative Bank (5) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from April 15, 2021 to April 15, 2026 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Taiwan Cooperative Bank (5) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 58,916   84,166
Secured Syndicated Loans from China Development Bank and 6 others (1) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable semi-annually from October 20, 2016 to October 19, 2024 with semi-annually interest payments. Interest-only payment for the first and the second year.    
Secured Syndicated Loans from China Development Bank and 6 others (1) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 0   1,915,577
Secured Syndicated Loans from China Development Bank and 6 others (2) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable semi-annually from March 19, 2021 to March 18, 2031 with semi-annually interest payments. Interest-only payment for the first and the second year.    
Secured Syndicated Loans from China Development Bank and 6 others (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 11,766,832   12,415,200
Secured Long-Term Loan from First Commercial Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from December 2, 2021 to December 2, 2026 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from First Commercial Bank [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 35,668   47,000
Secured Long-Term Loan from KGI Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on December 25, 2026 with monthly interest payments.    
Secured Long-Term Loan from KGI Bank [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 21,000   21,000
Secured Long-Term Loan from Shanghai Commercial Bank(1) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from January 19, 2022 to December 15, 2026 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Shanghai Commercial Bank(1) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 16,650   22,200
Unsecured Long-Term Loan from Bank of China [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable semi-annually from June 24, 2023 to June 24, 2026 with quarterly interest payments.    
Unsecured Long-Term Loan from Bank of China [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 1,515,790   1,797,364
Unsecured Long-Term Loan from Bank of Taiwan [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from March 24, 2023 to December 24, 2025 with monthly interest payments.    
Unsecured Long-Term Loan from Bank of Taiwan [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 1,333,333   2,000,000
Unsecured Revolving Loan from First Commercial Bank (1) (Note A) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on February 25, 2026 with monthly interest payments.    
Unsecured Revolving Loan from First Commercial Bank (1) (Note A) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 0   300,000
Unsecured Revolving Loan from First Commercial Bank (2) (Note A) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on March 15, 2026 with monthly interestpayments.    
Unsecured Revolving Loan from First Commercial Bank (2) (Note A) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 0   300,000
Unsecured Revolving Loan from First Commercial Bank (3) (Note A) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on June 15, 2026 with monthly interestpayments.    
Unsecured Revolving Loan from First Commercial Bank (3) (Note A) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 0   200,000
Unsecured Revolving Loan from First Commercial Bank (4) (Note B) [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 800,000   0
Redemption Settlement due on July 13, 2028 with monthly interest payments.    
Secured Long-Term Loan from CTBC Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 131,750   0
Redemption Repayable semi-annually from September 25, 2023 to September 25, 2028 with monthly interest payments. Interest-only payment for the first and the second year.    
Secured Long-Term Loan from Taiwan Cooperative Bank (6) [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 34,400   0
Redemption Repayable quarterly from December 28, 2023 to December 28, 2028 with monthly interest payments. Interest-only payment for the first year.    
Unsecured Revolving Loan from CTBC Bank (Note D) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on July 20, 2025 with monthly interest payments.    
Unsecured Revolving Loan from CTBC Bank (Note D) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,000,000   0
Secured Long-Term Loan from Shanghai Commercial Bank (3) [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans     0
Redemption Repayable quarterly from June 6, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Shanghai Commercial Bank (3) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 45,000    
Secured Long-Term Loan from Shanghai Commercial Bank (2) [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans     0
Redemption Repayable quarterly from March 23, 2023 to March 15, 2028 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Shanghai Commercial Bank (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,980    
Secured Long-Term Loan from Mega International Commercial Bank (3) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from December 22, 2022 to February 23, 2027 with monthly interest payments. Interest-only payment for the first year.    
Secured Long-Term Loan from Mega International Commercial Bank (3) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 46,265   60,500
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable annually from March 2, 2023 to March 2, 2026 with monthly interest payments.    
Unsecured Revolving Loan from Yuanta Commercial Bank (Note C) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 3,000,000   $ 0