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Contents of Significant Accounts - Details of Long-term Loans (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 36,476,909   $ 22,883,344
Less: Current portion (5,528,409)   (2,227,096)
Total 30,948,500 $ 943,840 20,656,248
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 36,476,909   $ 22,883,344
Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Interest rates applied 1.53% 1.53% 1.67%
Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Interest rates applied 5.49% 5.49% 6.56%
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 $ 0   $ 4,866
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 $ 9,529   13,765
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 $ 32,029   46,265
Secured Long-Term Loan from Mega International Commercial Bank (4) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from April 10, 2024 to March 15, 2031 with monthly interest payments. Interest-only payment for the first three years.    
Secured Long-Term Loan from Mega International Commercial Bank (4) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 41,050   0
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 $ 11,892   23,784
Secured Long-Term Loan from Taiwan Cooperative Bank (2) [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 (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 8,000   20,000
Secured Long-Term Loan from Taiwan Cooperative Bank (3) [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 (3) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,138   10,345
Secured Long-Term Loan from Taiwan Cooperative Bank (4) [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 (4) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 33,667   58,916
Secured Long-Term Loan from Taiwan Cooperative Bank (5) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from December 28, 2023 to December 28, 2028 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 $ 34,400   34,400
Secured Long-Term Loan from Taiwan Cooperative Bank (6) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from October 15, 2024 to October 15, 2031 with monthly interest payments. Interest-only payment for the first and the second year.    
Secured Long-Term Loan from Taiwan Cooperative Bank (6) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 19,500   0
Secured Syndicated Loans from China Development Bank and 6 others [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 [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 10,025,233   11,766,832
Secured Long-Term Loan from First Commercial Bank (1) [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 (1) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 24,076   35,668
Secured Long-Term Loan from First Commercial Bank (2) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from March 22, 2024 to March 15, 2031 with monthly interest payments. Interest-only payment for the first three years.    
Secured Long-Term Loan from First Commercial Bank (2) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 63,080   0
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 $ 11,100   16,650
Secured Long-Term Loan from Shanghai Commercial Bank (2) [member]      
Disclosure of detailed information about borrowings [line items]      
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 $ 4,046   4,980
Secured Long-Term Loan from Shanghai Commercial Bank (3) [member]      
Disclosure of detailed information about borrowings [line items]      
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 $ 36,563   45,000
Secured Long-Term Loan from Shanghai Commercial Bank (4) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from September 20, 2024 to March 15, 2028 with monthly interest payments.    
Secured Long-Term Loan from Shanghai Commercial Bank (4) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 9,100    
Secured Long-Term Loan from CTBC Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
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 CTBC Bank [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 131,750   131,750
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 $ 1,237,490   1,515,790
Unsecured Long-Term Loan from Bank of Taiwan (1) [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 (1) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 666,666   1,333,333
Unsecured Long-Term Loan from Bank of Taiwan (2) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from November 24, 2026 to November 24, 2028 with monthly interest payments.    
Unsecured Long-Term Loan from Bank of Taiwan (2) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 2,000,000   0
Unsecured Long-Term Loan from Mega International Commercial Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from April 10, 2024 to March 15, 2031 with monthly interest payments. Interest-only payment for the first three years.    
Unsecured Long-Term Loan from Mega International Commercial Bank [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 77,250   0
Unsecured Long-Term Loan from Taiwan Cooperative Bank (1) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from April 10, 2024 to March 15, 2031 with monthly interest payments. Interest-only payment for the first and the second year.    
Unsecured Long-Term Loan from Taiwan Cooperative Bank (1) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 115,970   0
Unsecured Long-Term Loan from Taiwan Cooperative Bank (2) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable quarterly from July 17, 2027 to July 17, 2029 with monthly interest payments.    
Unsecured Long-Term Loan from Taiwan Cooperative Bank (2) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 3,000,000   0
Unsecured Long-Term Loan from Eastern International Bank [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable monthly from April 10, 2024 to March 15, 2029 with monthly interest payments. Interest-only payment for the first and the second year.    
Unsecured Long-Term Loan from Eastern International Bank [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 59,380   0
Unsecured Revolving Loan from First Commercial Bank (1) (Note A) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on July 13, 2028 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   800,000
Unsecured Revolving Loan from First Commercial Bank (2) (Note B) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on August 22, 2029 with monthly interest payments.    
Unsecured Revolving Loan from First Commercial Bank (2) (Note B) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 800,000   0
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 $ 2,000,000   3,000,000
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 $ 0   4,000,000
Unsecured Revolving Loan from Mega International Commercial Bank (Note E) [Member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable semi-annually from November 28, 2025 to May 28, 2028 with monthly interest payments.    
Unsecured Revolving Loan from Mega International Commercial Bank (Note E) [Member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 3,000,000   0
Unsecured Revolving Loan from Taipei Fubon Bank (Note F) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Repayable annually from January 20, 2026 to January 20, 2029 with monthly interest payments.    
Unsecured Revolving Loan from Taipei Fubon Bank (Note F) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 3,000,000   0
Unsecured Revolving Loan from DBS Bank (Note G) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on December 25, 2029 with monthly interest payments.    
Unsecured Revolving Loan from DBS Bank (Note G) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,700,000   0
Unsecured Revolving Loan from DBS Bank (Taiwan) (Note H) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on December 13, 2029 with monthly interest payments.    
Unsecured Revolving Loan from DBS Bank (Taiwan) (Note H) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 4,000,000   0
Unsecured Revolving Loan from Australia and New Zealand Bank (Note I) [member]      
Disclosure of detailed information about borrowings [line items]      
Redemption Settlement due on September 26, 2029 with monthly interest payments.    
Unsecured Revolving Loan from Australia and New Zealand Bank (Note I) [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term loans $ 1,300,000   $ 0